Vivo V27 Bootloop Problem, How to Fix it Without Data Loss | Dr.fone
Vivo V27 Bootloop Problem, How to Fix it Without Data Loss
Have you, like many other users, faced the bootloop Android problem and wondered what exactly is Android boot loop. Well, Android boot loop is nothing but an error that makes your phone switch on itself every time you manually turn it off. To be precise, when your Vivo V27 does not remain switched off or powered off and starts to boot up automatically after a few seconds, it might be stuck in the boot loop Android.
An Android boot loop is a very common problem and is one of the first symptoms of a soft-bricked device. Also, when your device is experiencing Android boot loop issue, it does not start normally to reach the Home or Locked Screen and remains frozen at the Vivo V27 device’s logo, Recovery Mode or a lit-up screen. Many people fear losing their data and other files due to this error and thus, it is a very confusing situation to be in.
We understand the inconvenience caused, therefore, here are ways to tell you how to fix the bootloop problem in Android devices without losing any important data.
However, before moving on, let us learn a little about the causes for the Android boot loop error.
Part 1: What might cause the bootloop issue on Android?
Android boot loop error might seem weird and unexplainable but it occurs because of some specific reasons.
Firstly, please understand that it is a misnomer that boot loop error occurs only in a rooted device. Boot loop Android error can also occur in a stock device with the original software, ROM, and firmware.
In a rooted device, changes made, such as flashing a new ROM or customized firmware which are not compatible with the Vivo V27 device’s hardware or existing software, can be blamed for the boot loop problem.
Moving on, when your device’s software is unable to communicate with the system files during the start-up process, Android boot loop problem may arise. Such a glitch is caused if you have recently updated the Android version.
Also, corrupt App update files may also cause the bootloop Android issue. Apps and programs downloaded from unknown sources bring in a particular type of virus that prevents you from using your device smoothly.
All-in-all, Android boot loop error is a direct outcome of when you try to tamper with your device’s internal settings.
Hence, if you are looking for ways to guide you about how to fix boot loop issue, you will have to revamp the Vivo V27 device internally by either resetting it or adopting a recovery method.
Read on to know more about how to fix the bootloop error without any data loss when your device suffers from the bootloop Android problem.
Part 2: One click to Fix Android Bootloop without factory reset
If you are trying to figure out how to fix boot loop, the first option you have is the one-click fix to Android Bootloop which involves using the Dr.Fone - System Repair software.
This is designed to repair any data corruption on your device and restores your firmware to its usual working condition.
Dr.Fone - System Repair (Android)
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- #1 Android repair solution from your PC, can fix a wide range of Android system issues, such as boot loop, black screen, etc.
- The software requires no technical expertise, and anybody can use it
- A one-click solution when learning how to fix Android boot loop
- Not require root Android phones.
- Works with most Vivo V27 devices, including the latest Vivo V27 phones like S22
- Simple and easy-to-use user interface
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To help you get started, here’s a step-by-step guide on how to use Dr.Fone - System Repair.
Note: This method can erase data on your device, including your personal files, so make sure you’ve backed up your device before proceeding.
Step #1 Download the Dr.Fone - System Repair software from the website and install it onto your computer.
Open the software and select the System Repair option from the main menu to fix the Android bootloop error.
Step #2 Connect your Vivo V27 to your computer using the official cable and select the “Android” option from the three menu items. Click “Start” to confirm.
You’ll then need to input the Vivo V27 device information, such as your carrier info, device name, model, and country/region in order to ensure you’re downloading and repairing the correct firmware to your phone.
Step #3 Now you’ll need to put your phone into Download Mode to remove the Android bootloop.
For this, you can simply follow the onscreen instructions for both phones with and without home buttons.
Click “Next”, and the software will begin downloading the firmware repair files.
Step #4 Now you can sit back and watch the magic happen!
Make sure your computer stays connected to the internet, and your device stays connected to your computer throughout the entire process. Once the firmware has been downloaded, it will be automatically installed onto your mobile device, removing the boot loop Android error.
You’ll be notified when the process is done and when you can remove your device and start using free from the boot loop Android error!
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Greeting Card BuilderPart 3: Soft reset to fix Android bootloop issue
When your device is stuck in Android boot loop, it does not necessarily mean that it is bricked. Boot loop might be occurring due to a simpler problem which can be fixed by turning off your device. This sounds like a home remedy for a serious problem but it works and resolves the problem most of the time.
Follow the steps given below to soft reset your device:
Turn the Vivo V27 device off and take out its battery.
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If you cannot take the battery out, let the phone be off for about 3 to 5 minutes, and then turn it back on.
Simply performing a soft reset on your device can help you if you are looking for solutions for how to fix the bootloop issue. This a very useful method as it does not result in any kind of loss in data and protects all your media files, documents, settings, etc.
In case the Vivo V27 device does not turn on normally and is still stuck in the bootloop Android problem, be prepared to use the troubleshooting techniques given and explained below.
OtsAV Radio WebcasterPart 4: Boot into Safe Mode to fix Android boot loop
Booting your Vivo V27 into Safe Mode is a useful troubleshooting step to fix boot loop issues caused by third-party apps. When in Safe Mode, the Vivo V27 device will start up with only essential system apps, and any downloaded apps that might be causing conflicts won’t run. Here’s how you can boot your Vivo V27 into Safe Mode to address the boot loop problem:
Step 1: Power Off Your Device
Hold down the power button until it turns off completely.
Step 2: Access Safe Mode
To enter Safe Mode, follow these steps based on your device model:
- For most Android devices: Press and hold the power button to turn on your device. As soon as the manufacturer’s logo appears, press and hold the Volume Down button until the Vivo V27 device finishes booting. You should see “Safe Mode” displayed in the bottom left or right corner of the screen.
- Some devices might require slightly different key combinations. Refer to your device’s user manual or perform an online search for the specific method to enter Safe Mode for your model.
Step 3: Observe the Vivo V27 device
Once your device has booted into Safe Mode, use it for a while to see if the boot loop issue persists. If the boot loop doesn’t occur in Safe Mode, it indicates that the problem is likely caused by a third-party app.
Step 4: Identify and Uninstall Problematic Apps
Now that you’re in Safe Mode, it’s time to identify the troublesome app. Start by uninstalling recently installed apps one by one until the boot loop problem is resolved. After each uninstallation, restart your device normally to check if the boot loop still occurs. Continue this process until you find the problematic app.
Step 5: Restart Normally
Once you’ve identified and uninstalled the problematic app, restart your device normally to exit Safe Mode. Your Android device should now start up without getting stuck in a boot loop.
By following these steps and using Safe Mode to isolate problematic apps, you can effectively troubleshoot and resolve boot loop issues on your Vivo V27.
Part 4: Factory reset to fix Android bootloop issue
Factory reset, also known as Hard Reset, is a one-stop solution for all your software resulting in issues. Android boot loop being such problem, can be easily overcome by performing a factory reset.
Please note that all your device’s data and settings will be deleted by adopting this method. However, if you have a Google account signed in on your Vivo V27, you will be able to retrieve most of your data once the Vivo V27 device turns on.
To factory reset your Android boot loop device, you must first boot into the Recovery Mode screen.
To do this:
Press the volume down button and power button together until you see a screen with multiple options before you.
When you are at the Recovery Mode screen, scroll down using the volume down key, and from the options given, select “Factory Reset” using the power key.
Wait for your device to perform the task and then:
Reboot the phone in Recovery Mode by selecting the first option.
This solution is known to fix the boot loop error 9 out of 10 times, but if you still can’t start your Vivo V27 normally, consider using a CWM Recovery to resolve the Android boot loop issue.
Part 5: Use CWM Recovery to fix bootloop on rooted Android
CWM stands for ClockworkMod and it is a very popular custom recovery system. To use this system to solve the boot loop Android error, your Vivo V27 must be rooted with CWM Recovery System which basically means CWM must be downloaded and installed on your device.
Furthermore, to use CWM Recovery to fix boot loop on rooted Android devices, follow the steps given below:
Press the home, power, and volume up buttons to launch the CWM Recovery screen.
Note: you might have to use a different combination of keys to enter into Recovery Mode, depending on your device’s model.
Scroll down using” the volume key to select “Advanced”.
Now select “Wipe” and choose to wipe “Dalvik Cache”.
In this step, select “Mounts and Storage” to click on “Wipe” or “Cache”.
Once this is done, make sure to reboot your Vivo V27.
This process with successfully fix the Android boot loop error and not cause any loss of data stored on your device stuck in boot loop.
So the bottom line is that boot loop Android issue may seem like an irreparable error but it can be resolved by carefully following the techniques explained above. These methods not only tell you how to fix the bootloop problem but also prevent it from occurring in the future.
An Android boot loop is a common phenomenon with all Android devices because we tend to tamper with our device’s internal settings. Once the ROM, firmware, kernel, etc are damaged or rendered incompatible with the Vivo V27 device’s software, you cannot expect it to function smoothly, hence, the boot loop error occurs. Since you are not the only one suffering from the Android boot loop problem, be rest assured that the ways, given above, to combat it are recommended by users facing similar troubles. So, don’t hesitate and go ahead to try them on.
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Reasons for Vivo V27 Stuck on Startup Screen and Ways To Fix Them
There are many reasons why phones get stuck on the boot screen. It could be something as simple as physical damage or more complicated related to software problems. Having your phone stuck on the logo screen, or boot screen is annoying, and it is no surprise that people will find ways to fix this issue when encountered.
This article will share the possible reasons why your phone is stuck on the boot screen. This article will share three possible reasons for this problem and three valuable tips to help fix this issue. If all else fails, there is an application that is recommended and is sure to solve your issue in no time. Keep on reading to find out more!
It is not uncommon for phones to be stuck on the startup screen, but finding out why this happens is tricky. This section identified some of the top reasons your cellphone could have gotten stuck on the startup screen.
Physical Damage to the Phone
If you accidentally dropped your phone or knocked it on a hard surface, you could have damaged the internal hardware of your phone. This could affect your phone’s ability to reboot and result in your phone being stuck on the boot screen.
If you are 100% certain that your phone has gone through physical damage, you should seek professional help to have your phone repaired or checked. It is advised not to fix this problem yourself as your phone’s internal parts are complicated and delicate. Look for an official phone repair store and get your phone fixed for issues like your phone getting stuck on the logo.
Liquid Damage
It is not common for your phone to expose to water. Rain or water splashes are unavoidable; sometimes, your phone gets wet. Little exposure to water on the surfaces of your phone is fine. However, if you fall into a pool with your phone or drop it in a puddle of water, your phone will likely suffer from liquid damage.
Even the tiniest water droplet that seeped into your phone could damage the internal hardware of your device, often leaving you with your phone stuck on the boot screen. The first thing to do when you accidentally submerge your phone in the water is to check if the water has damaged your phone.
For iPhone users, look for the water damage indicator. If you see that it has turned from white to red, it has suffered from water damage. You have two options if your phone has suffered liquid damage. One is dismantling your phone and letting it dry for at least 48 hours. Two is bringing your phone to a repair shop to fix it.
Software Issues
Software issues are probably the most common reason your phone is stuck on the logo screen. Eight times out of ten, software issues are either caused by a failed software update, using an older version of the operating system, or having a jailbroken phone. When the software does not successfully update, the phone will have no operating system, as the old system was erased before the new software was installed.
The older operating system is also not desired as your phone typically will send periodic updates to make sure your phone is up-to-date and free from bugs. Running applications on an older operating system might lead to issues like the phone being stuck on the boot screen or the logo. Hence, updating your phone to the latest software version would be better.
Part 2. 3 Helpful Ways To Fix Phones Stuck on Boot Screen
After understanding the common problems on why your phone is stuck on the startup screen page, here are three easy solutions to try solving yourself at home.
Hard reboot your phone
To quickly fix any of your phone issues, especially when stuck on the startup screen, perform a hard reboot. The term hard reboot means turning your device off and on again. You might think this is a simple option, but this is a tried and tested method that might work on a minor glitch that results in your smartphone getting stuck on the startup screen page.
Here is an example of performing a hard reboot for an Android phone such as Vivo V27. Preess and hold the Power and Volume Down buttons simultaneously for more than 7 seconds to perform the hard reboot.
Put your phone in recovery mode
If a hard reboot does not work, a natural next step is to try going into recovery mode. The recovery mode is specially designed to solve any software-related issues. It is important to note that entering recovery mode will delete all your corrupted files and replace them with a functional operating system. Hence, back up all your files to ensure you retain all your information.
Here is a step-by-step process for putting your Vivo V27 or Redmi smartphone in recovery mode.
Step 1: Tap and press the Power button to switch off your Vivo V27/Redmi phone
Step 2:Hold the Volume Up and the Power buttons at the same time, then release the keys when the Main menu of Recovery mode appears on the screen.
Step 3: You can use the volumes buttons to navigate up and down and press the Power key to confirm the selection.
Factory Reset
If you do not want to attempt recovery mode, you can try resolving the issue of your phone being stuck on the startup screen through Factory Reset. Factory Reset, also called Hard Reset, erases all information and data on your device. As a result, it will return to the settings and recover the data it used to have when leaving the factory.
Here is an example of putting your Samsang smartphone into the Factory Reset DFU mode.
Step 1: Open the Settings application on your phone and tap General Management.
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Step 2: Go to Reset > Factory data reset.
Step 3: Swipe to and tap Reset.
Note: Before carrying out a factory reset, you need to input the password of your Vivo V27 Account.
Bonus Tip: Best App To Solve Phone Stuck on Boot Screen
If all the solutions above do not work and you do not want to perform a factory reset on your phone, one option is to use an application called Wondershare Dr.Fone. It is one of the most effective phone recovery solutions and can help to bring your phone back to a state like it was brand new. Being stuck on the startup screen page will be a problem of the past.
The following steps will show you how to use Dr.Fone to perform system repair on your phone.
Step 1: To the Dr.Fone application using the link above and click on System Repair.
Step 2: Depending on the Vivo V27 device you are using, choose either Android or iPhone.
Step 3: In the next window, select the issue you are facing and click Start.
Step 4: Choose the corresponding Brand, Name, Model, Country, and Carrier from each drop-down menu and click Next.
Tip: Make sure the information you input is accurate, as it will affect the system repair if the information is inaccurate.
Step 5: Connect your device to your computer and follow the instructions on the screen to enter Download mode. Click on Next to proceed to the next step.
Step 6: Wait for the process to complete, and a new firmware will be updated on your device. Power on your phone and check if the issue still exists.
Frequently Asked Questions
The following are interesting and frequently asked questions about how to solve boot loops.
- What is a boot loop?
A boot loop describes a process when Your Vivo V27 stays stuck in a circle of rebooting. When your phone is stuck on the startup screen, one of the strategies you will try is to restart your device. However, when your phone gets stuck in a boot loop, it is your device’s way of trying to turn it off and on again to fix the issue.
Since there is an issue with the booting process, it will keep running into the same error repeatedly, calling the boot loop. When trapped in a boot loop, your device will keep turning off and on. Most boot loop issues are software-related, such as a wrong system update.
- How do you fix a boot loop?
When stuck in a boot loop, there are different troubleshooting methods for other devices. For Android phones, force your phone into its Recovery mode; from there, you can restore a previous backup. This backup could be from when the boot loop did not exist, so recovery to that backup could quickly solve the problem.
For iPhones, it is the same concept as the Android, restore your phone to the previous backup. You can use iTunes to restore a previously stored backup on your computer.
- How to prevent a boot loop?
A boot loop typically starts when there is a change to your system before a reboot cycle. Most issues are software-related, such as having to do a system upgrade gone wrong or a problem that doesn’t mesh. One way to prevent this is to perform a software or system upgrade constantly. Make your phone juiced to prevent it from turning off mid-way when updating.
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Conclusion
This article summarizes some of the possible reasons why your phone is stuck on the boot screen. It demonstrated three useful strategies to overcome your phone stuck in the boot with ease. However, if all the above methods do not work, why not try Dr.Fone-System Repair?
Dr.Fone-System Repair repairs the operating system issues and fixes the issue with your phone. Once you power on your phone again, you can rest assured that it will be like new.
Authentication Error Occurred on Vivo V27? Here Are 10 Proven Fixes
There are times when users get an authentication error while they connect to a Wifi network. The problem is mostly found in Android whenever a device tries to establish a connection to Wifi. If your device is also experiencing an authentication problem Wifi, then don’t worry. It can easily be resolved. In this post, we will make you familiar with the root cause for the Vivo V27 Wifi problem and how you can resolve whenever authentication error occurred on your device.
Part 1: Any idea about the Wi-Fi authentication problem?
Wi-Fi authentication has to be done every time you wish to connect to a Wi-Fi network over your smartphone or laptop. To authenticate yourself and connect to the protected Wi-Fi network, you need to have the password of it. But if after you’re putting in the correct password and still experiencing the wifi authentication problem. Here’s what you need to know.
Authentication error occurs when the “deal” between the Wi-Fi router and device fails due to certain reasons. First, the Vivo V27 device sends the password of the network and the “connect” request in an encrypted format to the Wi-Fi router. Then, the router decrypts the password and compares the password saved on it. Now, if the password matches, it sends affirmation for the “connect” request, and then the Vivo V27 device is allowed to connect to the network.
Part 2: Why Authentication Error Occurred when Connecting to Wifi?
There could be plenty of reasons for facing an authentication error on your device. Most of the time, it occurs whenever a Wifi router seems to malfunction. Furthermore, if your phone has been recently updated, then chances are that there could be an issue with its drivers. A security attack can also make your device malfunction as well. An unstable connection or a router blockage can also be a reason for this issue.
In this scenario, whenever you try to connect to a Wifi network (even after supplying the correct password and username), it doesn’t connect to it. Instead, it displays an authentication error occurred promptly. Thankfully, there are plenty of ways to overcome the authentication problem Wifi. In the next section, we have provided three different solutions to fix the Vivo V27 Wifi problem (as it mostly happens on Android devices).
Part 3: 10 Solutions to Fix Wifi Authentication Error
Before we make you familiar with different fixes for the Wifi authentication error, it is important to check your router beforehand. Chances are that you could be getting the authentication error because your router is not functioning properly. You can restart it and try to connect any other device to it as well to check it. After making sure that there is no problem with your network or router, follow these suggestions to overcome the authentication error occurred issue.
Check if extra characters added in Wi-Fi password
Ensure that no other extra characters are being added in the Wi-Fi password while you’re entering it. Key in the password carefully while viewing the characters, and then check if the authentication error occurs or not.
One-Click to Fix Wifi Authentication Error by Android System Repair
Android system repair is considered the most effective way to fix Wifi Authentication Error. As the bottom-layer Android system files may be corrupted unconsciously with days of phone use, the Wifi Authentication Error may be one of the symptoms.
So Android repair requires programming knowledge to do it?
No! With Dr.Fone - System Repair (Android), you can do Android repair in just a few steps and get all issues like Wifi Authentication error fixed easily.
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- One-click to fix the Wifi authentication error. No technical skills required.
- Supports all the new Vivo V27 devices like Galaxy S8, S9, etc.
- Easy-to-follow instructions provided on each of the screens.
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Here are the steps to fix Wifi Authentication Error by Android system repair:
Note: Android repair is effective to permanently fix Wifi Authentication Error, but may wipe out the existing phone data. Backup all the important Android data to PC before you go on.
- After the Dr.Fone tool is downloaded, install, and launch it. You can see the following screen.
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- Connect your Vivo V27 to the computer, and select “Android Repair” in the middle.
- Select all the details that match your device, and click “Next”.
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- Next up, you should boot your Vivo V27 in download mode by following the on-screen instructions.
- Allow the program to download the corresponding firmware. After that, the Android repair will start and get the Wifi Authentication Error fixed in minutes.
Use static IP address instead of DHCP
DHCP, or Dynamic Host Configuration Protocol is the default IP address assignment for the Wi-Fi settings on many devices. Whereas DHCP can cause IP address conflict during the dynamic IP address assignment. So, you’d better change “DHCP” to “Static” to see if the authentication error persists.
Step 1: Head to the “Settings” of your Vivo V27 and then opt for “Wireless and Networks” followed by “WLAN/WiFi”.
Step 2: Now, hit on the WiFi network that is showing “authentication error occurred”.
Step 3: Depending on your Vivo V27 model, look for “IP Settings” and tap on it. Now, switch the “DHCP” to “Static”.
Step 4: Note down the static IP address fields and wipe off all the fields. Punch it in again and then save it.
Check carefully for duplicate Wi-Fi names before you connect
Perhaps, you might connect to a WiFi with a similar name. There are good chances that some users do not modify their WiFi network name and possibly, your neighbor may have the same WiFi network, service provider. Therefore, ensure you connect to the correct WiFi network.
Reset the Wifi network
One of the easiest ways to fix the authentication problem of Wifi is to reset the network. To do this, you would be required to forget the respective network first and then connect to it again. This can be done by simply following these steps.
1. Firstly, you need to forget a Wifi network. To do it, go to your phone’s Settings > WiFi and network. From here, you can see a list of all the Wifi hotspots that your phone connects to. Select the network you wish to forget.
2. When you would select a network, it will provide the basic information related to it. Just tap on the “Forget” button and agree to the pop-up message. This will erase the network’s information from your device.
3. Afterward, turn on your Wifi again and tap to the network you wish to connect to. Simply provide the credentials and tap on the “Connect” button to reestablish the connection. This way, you can reset the network successfully.
Modify network connection
If the above solution won’t work, then you would be required to walk the extra mile to fix the Vivo V27 Wifi problem. After you reset a network connection, if still getting issues regarding the authentication of the network, you need to modify the connection. In this technique, you will be changing the IP settings on your phone to alter the way it establishes a secure connection. You can do it by following these steps.
1. To start with, visit your phone’s Settings and open the Wifi page.
2. This will display a list of all the Wifi networks that are associated with your device. Just long-tap on the Wifi network that you wish to modify. It will open another pop-up window. From here, tap on the option of “Manage network settings”. Sometimes, users also get an option of “Modify network settings” here as well. Simply select it to proceed.
3. It will display basic information related to your Wifi network. Just tap on the “Show advanced options” button to access more options related to the network setting.
4. From the IP Settings menu, change the field from DHCP to Static. This will let you establish a static connection between your device and the router.
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5. As soon as you will change it to static, you will get different fields related to your network’s IP address, gateway, DNS, and more. Simply fill these fields and tap on the “Save” button once you are done.
Now, try to connect to the Wifi hotspot again. You would be able to overcome the authentication problem of Wifi.
Change Network Security Type
It has been observed that, when we connect to Wifi, our device chooses a wrong security type. This clashes with the default security protocol of the router and authentication error occurred due to this. If your device is facing the same issue, then it can be fixed by simply changing its security type. To do this, follow these instructions:
1. To change the security type of a network, you need to “Add the network”. If you already have the Wifi network saved, then simply forget the network by following the above-mentioned tutorial.
2. Now, turn on your device’s Wifi and tap on the option of “Add network”. Here, you would be asked to give a network name and select the security type. To manually select it, tap on the “Security” option.
3. From here, you will get a list of various security protocols that you can pick. Select “WPA/WPA2-PSK” and save your selection.
Now, try to connect to the network again. Most likely, it will let you fix the authentication error on your device.
Update Android firmware to the latest
There are instances where an outdated OS version of your Vivo V27 may create a hindrance in establishing a connection between your device and the WiFi network. You need to update your Android firmware to the latest version and then check if the problem persists or not.
Step 1: Launch “Settings” of your Vivo V27 and then get into the “About Phone” option.
Step 2: Now, opt for the “System Update” option. If the update is available, get your device updated to the latest OS version.
Restart the router and reset Android network settings
Sometimes, the WiFi router may hang up while establishing a connection and therefore, the wifi authentication problem occurs. Try restarting your Wi-Fi router and then check if your device connects successfully. If this doesn’t work, try to reset your Android Network Settings .
Bonus tip: Turn Airplane mode on/off
By simply turning on the Airplane mode (and later turning it off), you can easily fix the authentication problem Wifi most of the time. You can find a toggle button for Airplane mode on the notification bar of your phone. If you can’t find it there, then go to your phone’s Settings > Connection > More Networks and turn on the feature of “Airplane Mode”.
Let it do for a while. Afterward, turn it off and try to connect to the Wifi network again.
After following these quick and easy suggestions, you would be able to fix the Vivo V27 Wifi problem for sure. Even if you use any other Android device, then its authentication error can easily be resolved after these effective solutions. Go ahead and give these expert solutions a try and let us know about your experience as well. If you have any other solution to fix the authentication problem Wifi, then share it with us as well in the comments.
- Title: Vivo V27 Bootloop Problem, How to Fix it Without Data Loss | Dr.fone
- Author: Ariadne
- Created at : 2024-07-30 12:04:08
- Updated at : 2024-07-31 12:04:08
- Link: https://howto.techidaily.com/vivo-v27-bootloop-problem-how-to-fix-it-without-data-loss-drfone-by-drfone-fix-android-problems-fix-android-problems/
- License: This work is licensed under CC BY-NC-SA 4.0.