What To Do When Xiaomi 14 Has Black Screen of Death?

Have you ever got the error of freezing the Android device home screen? Or the notification light keeps blinking without anything shown on display? Then you are facing Android black screen of death.

This scenario is common with many Android mobile users, and they always hunt for solutions to get rid of this Android black screen problem. Here are some more situations that can assure you that you are facing Android black screen of death.

The light of the phone is blinking but the Xiaomi 14 device is not responding.
The phone is hanging and freezing very frequently.
The mobile is rebooting and crashing more often and the battery is draining a lot faster.
Phone restarts on its own.

If you face these situations, you might be facing the Android black screen of death issue. Follow this article, and we’ll discuss how to get rid of this annoying problem at ease.

Part 1: Why Android device gets black screen of death?

Similar to the “Blue Screen of Death “ (BSOD) on computers, the Android Black Screen of Death indicates a severe system crash or malfunction. When this issue occurs, the Xiaomi 14 device’s display remains blank, and you are unable to interact with the Xiaomi 14 device, access apps, or perform any actions. The cause of the Android black screen of death can vary, but some common factors include:

Install incompatible apps or apps with bugs and viruses.
Have bugs or errors in the Android operating system.
Keep the mobile charged for long after it’s fully charged.
Use a non-compatible charger.
Use an old battery.
Incorrectly install or incomplete system updates.
Excessive heat due to heavy usage or environmental factors.

If you face the situations mentioned above, this is clearly a case of the Android screen black. But don’t worry about that. You can follow the article below to get rid of this situation on your own.

Part 2: How to rescue data when Android gets black screen of death?

This annoying Android black screen of death is making it impossible to access your internal data. So, the possibility is that you might lose all the data. We have a solution for all of your data recovery problems from a damaged Android device.

The solution for recovery data is the Dr.Fone - Data Recovery (Android) toolkit by Wondershare. This tool is highly appreciated worldwide and very popular for its feature-rich user interface. This tool can perform a lot of functions that can successfully recover the data from a damaged device.

Use this revolutionary toolkit to get the data back from the black tablet screen of death. Connect the Xiaomi 14 device with the PC after installing this tool and follow the on-screen instruction, and all of your data will be transferred to your PC. Unfortunately, the tool is supported on selected Xiaomi 14 Android devices as of now.

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Part 3: 9 Solutions to fix the black screen of death of Android

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3.1 One click to fix the black screen of death

Facing an Android device with a black screen of death, I believe, is one of the gloomiest moments of one’s life, especially for those who know little about the technical part of Android. But here is the truth we have to admit: most cases of the black screen of death arise due to system glitches in Android.

What to do? Shall we find someone who is tech-savvy to seek help? Come on, this is the 21st century, and there are always one-click solutions to deal with technical issues for laymen like you and me.

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Support all the new Xiaomi 14 devices like Galaxy S22, S23, etc.
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Here are the easy steps to get your Xiaomi 14 out of the black screen of death:

Download and install the Dr.Fone tool. After launching it, you can see the following screen pop up.

![fix android black screen of death using a tool](https://images.wondershare.com/drfone/guide/drfone-home.png)

Select “System Repair” from the home page, and then click on the “Android “.
Click “Start” to commence the Android system repair. In the next screen, select and confirm your Android model details like name, model, country, etc. and go on.

![choose android info](https://images.wondershare.com/drfone/guide/android-system-repair-2.png)

Boot your Android into Download mode by following the on-screen demonstrations.
Then the tool will download the Android firmware and flash the new firmware to your Xiaomi 14.
A moment later, your Xiaomi 14 will be repaired completely, and the black screen of death will be fixed.

Video guide: How to fix the Android black screen of death step by step

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3.2 Force restart your Xiaomi 14

Because it is the quickest and most painless solution, most people do this when their Android phone screen goes black too fast. The majority of phone issues can be resolved by performing a hard reboot. Here are the necessary measures if you haven’t tried this method before.

To reboot your Xiaomi 14, you may need to press a specific key combination, depending on the model you have, but most Android devices can be force restarted by doing the following steps:

Step 1: Press and hold the power button for about 10-15 seconds. Keep holding it until the Xiaomi 14 device restarts.

Step 1: For Xiaomi 14 devices, press and hold down the Power and Volume Down buttons for about 7 seconds.

3.3 Check and clean your phone

This method might not be popular with Android users, but this can do wonders when dealing with an Android black screen of death issue. To do this, follow the steps provided below:

Step 1: Ensure your phone’s buttons and ports are not stuck before anything else.

Step 2: See if dirt prevents you from turning the Xiaomi 14 device on. Then, quickly press and release the button a few times.

Step 3: If the phone isn’t charging normally, ensure the charging port isn’t clogged with dust and debris by checking and cleaning it. You can gently blow out any debris in the charging port or use a wooden toothpick to pry it open.

Step 4: After you’re done with the cleaning, it’s best to charge the phone for at least 10 minutes. Just give it a quick charge and then try to restart it.

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3.4 Remove the battery

If your phone’s battery is removable, you can try taking it out and trying again if restarting and cleaning it doesn’t fix the problem.

Step 1: To get started, take the phone apart by starting at the back.

Step 2: After 20 to 30 seconds, take out the battery and put it back in.

Note: When replacing the battery, ensure the metal contacts correctly connect to the phone.

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This easy and straightforward method should help you fix your Android screen black issue, but if it doesn’t, continue reading, as this article got more techniques you can try.

3.5 Recharge the Xiaomi 14 device

If your Xiaomi 14 screen suddenly goes black, let the battery die completely. Then once the battery is completely dead, you should plug it in to charge and turn it on by pressing the Power button. Try to check if you still encounter the issue after doing so.

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3.6 Wipe cache partition to fix black screen of death

If your Xiaomi 14 turns on, but the screen remains black, clearing the cache partition should solve the problem. After all, keeping caches on your phone would cause it to run more slowly and cause other problems. Therefore, the issue can be resolved by clearing the cache partition. Check the following steps on how to do this below:

Step 1: Turn off your Xiaomi 14.

Step 2: Boot the Xiaomi 14 device into Recovery Mode.

Note: The steps necessary to enter recovery mode will vary depending on your specific Android phone model. To ensure you’re doing the correct steps for your device, consult the user manual or look it up online. The following instructions work for Xiaomi 14 devices:

For older Xiaomi 14 devices with the home button: Press and hold the Volume Up button, the Power button, and the Home buttons simultaneously.
For newer Xiaomi 14 devices without the home button: Press and hold the Volume Up button and the Power button together.
If the Xiaomi 14 device logo appears, release your grip, and the phone will restart.

Step 3: Find the Wipe cache partition option using the volume controls after entering Recovery Mode.

Step 4: Select Wipe cache partition by pressing the Power button.

Step 5: On the next screen, use the Volume Down button to highlight “Yes” and then press the Power button to confirm the cache wipe.

Step 6: The cache partition will be wiped, and you will see the “Cache wipe complete” message on the screen.

Step 7: Use the Volume Down button to navigate to the “Reboot system now” option and press the Power button to reboot your Xiaomi 14 device.

After rebooting, you can see that you have successfully got rid of the annoying Android black screen of death. For most of the cases, this method solves the problem. If not, you have to move to the next method.

3.7 Uninstall incompatible apps

Android screen black can be a result of installing a bug or incompatible apps. If you have recently installed an app that crashes frequently, that may be the reason for the issue. Uninstalling the app from the Xiaomi 14 device may solve the problem with ease. For doing this, you need to boot your device in Safe mode. Follow the below steps.

Step 1: Power down your device by pressing and holding the Power button until a menu appears.

Step 2: Navigate to Safe Mode by pressing and holding the Power Off button.

Step 3: Tap the “Safe mode” icon to enter Safe mode. You should now see Safe Mode at the Xiaomi 14 device’s bottom.

Step 4: After selecting Settings, head to the Apps section.

Step 5: Select the app by clicking on it; the App Info window should appear. To uninstall the app, tap the Uninstall option from the menu below the screen.

Step 6: Now restart the Xiaomi 14 device by pressing the power button and let it boot up in normal mode.

If the app is the reason for Android black screen of death, then after uninstalling, you can get rid of this issue. If not, now you have to factory reset your device to solve the problem.

3.8 Reboot to safe mode

Even after multiple attempts to launch them, certain applications act suspiciously and cause the Xiaomi 14 device to crash. When an Android phone suddenly goes black, you can often isolate the problem to a specific app by booting into Safe mode.

Step 1: Begin by restarting your phone. To do that, press the Power button until a menu appears.

Step 2: Press the Power Off button to enter Safe mode.

Step 3: Activate Safe mode by clicking the “Safe Mode” icon.

Step 4: To return to Normal mode, turn off your device and then turn it back on.

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3.9 Factory reset to fix Android black screen of death

The factory reset is the option that enables the factory state of your device by erasing all data, settings, bugs, and apps. Your device will be fresh like factory condition after this reset. Worth mentioning here, you’ll lose all the internal data and installed apps after this reset. So, to overcome the Android tablet black screen of death, you must perform this action as the last option. Follow the below steps carefully.

Step 1: Turn off the Xiaomi 14 device. Then press the Volume Up + Power button + home button (or press Volume Up + Power buttonS) altogether and let the mobile boot into recovery mode.

Step 2: After booting up in recovery mode, you can find the “Factory data reset” option. Navigate to that option with the volume up and down arrow and select it with the power button.

Step 3: In this step, you need to confirm your action by tapping on the “Yes” option. After this, your device will start erasing. This may take a while to complete the whole process.

Now, your device will reboot automatically and you can see the Android black screen of death problem is solved.

Part 4: How to avoid Android black screen of death?

These are the general methods to overcome the situation of Android screen black. But to avoid this situation, here are a few tips to follow –

Install apps from trusted suppliers only.
Use security or antivirus software on your device.
Take a backup at regular intervals.
Always keep Android OS updated.
Don’t keep your mobile charged for a long duration after a full charge.
If your battery gets old, replace it soon.
Keep your device’s storage well-maintained. Regularly delete unnecessary data.
Close unused apps running in the background to conserve system resources.
Prevent phone overheating by avoiding excessive usage, and not exposing it to direct sunlight for extended periods.

By following these steps, you should avoid the most unpleasant situations, such as the Android screen black. We all know that “Prevention is always better than cure”.

The Bottom Line

There could be a lot of reasons why an Android black screen issue occurs, but the important thing is knowing the correct ways how to fix it. And this article has covered nine proven methods to help you fix an Android phone screen black problem.

But among the methods discussed above, Dr.Fone – System Repair just stood out as this program does not only help you with a black screen of death problem, but it covers many other Android system issues too. It’s also a highly intuitive program that requires no skills to operate.

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Troubleshooting Guide: How to Fix an Unresponsive Xiaomi 14 Screen

Smart devices have become an integral part of our lives, and Xiaomi 14 phones are increasingly popular due to their advanced features and affordable prices. These phones offer numerous benefits, including high-quality cameras, fast processors, long-lasting batteries, and sleek designs.

However, like any other electronic device, Xiaomi 14 phones can sometimes encounter issues that may impede their functionality. One common problem that users face is an unresponsive screen, which can be frustrating and disruptive to daily activities.

This article will discuss some valuable solutions for dealing with Xiaomi 14 phone screen unresponsiveness. We will provide step-by-step instructions for troubleshooting and getting your phone back in working order. Whether you’re a novice or an experienced user, these tips and tricks will help you navigate this problem and get back to using your phone without any issues. So, let’s dive in and explore how to fix a Xiaomi 14 phone with an unresponsive screen.

What causes the Xiaomi 14 Screen unresponsive?

The Xiaomi 14 screen may become unresponsive due to various reasons. Here are some common situations and their possible causes:

During Use/Gaming: The screen may become unresponsive due to overheating when using or gaming on a Xiaomi 14 phone. This can be caused by running too many apps simultaneously or playing games for an extended period, especially on models such as the Xiaomi 14 9 Pro, which generates much heat during gaming.
**No Response When Touching the Screen:**Sometimes, the Xiaomi 14 screen may not respond when touched due to a faulty touch screen or display. This can happen due to physical damage or a manufacturing defect. Some Xiaomi 14 Nord 2 users have reported this issue.
After Dropping the Phone: If a Xiaomi 14 phone has been dropped, the screen may become unresponsive due to physical damage or a loose connection. This can happen to any model, including the Xiaomi 14.

Overheating, physical damage, and manufacturing defects are some common causes of Xiaomi 14 screen unresponsiveness, which may occur during use/gaming, no response when touching the screen, or after dropping the phone.

The common solutions to solve a Xiaomi 14 Screen unresponsive

Here are the three most common solutions to deal with phone screens being unresponsive, regardless of the brand:

Restart the Xiaomi 14 device

Restarting the Xiaomi 14 device is a simple and quick solution to an unresponsive phone screen. To restart the phone, press and hold the power button until the screen turns off, then press and hold the power button again to turn the phone back on.

Check the Charging Port and Battery

Sometimes, an unresponsive screen can be caused by a dead battery or a faulty charging port. To check for these issues:

Step 1: Plug the phone into a charger and wait for at least 30 minutes to see if the battery charges.

Step 2: Try a different charger or cable to see if the issue is with the charging accessories.

Contact the Pros

If the above solutions don’t work, contacting a professional is best. A trained technician can diagnose and fix the problem. Contact the phone manufacturer or an authorized repair center to get help with your phone.

For different Xiaomi 14 models, there may be additional solutions to consider:

Check the Phone’s Temperature

Sometimes, a Xiaomi 14 phone’s screen, specifically Xiaomi 14 8 Pro, may become unresponsive due to overheating. To check the phone’s temperature:

Step 1: Go to Settings > Battery > Battery Temperature.

Step 2: If the phone is overheating, let it cool down before using it again.

Reset to Factory Settings

A factory reset may help fix the problem if none of the above solutions work. Note that this will erase all data and settings on the phone, so be sure to back up your data before resetting. To reset the phone:

Step 1: Go to Settings > Additional Settings > Backup and Reset > Erase All Data.

Step 2: Follow the on-screen instructions to reset the phone.

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Replace a New Screen

If the phone’s screen is physically damaged or cracked, it may need to be replaced. To replace the screen:

Contact a professional repair center or the manufacturer for replacement parts and installation.

How to avoid Xiaomi 14 Screen being unresponsive?

To avoid Xiaomi 14 screen being unresponsive, here are some suggestions based on the possible causes:

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Check Software Updates on Time

Make sure to regularly check for and install software updates on your Xiaomi 14 phone. These updates often include bug fixes and security patches that can help prevent issues like overheating and screen unresponsiveness.

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Check Hardware from Time to Time

Regularly inspect your phone’s hardware components such as charging ports, battery, and screen for any signs of damage or wear and tear. If you notice any issues, get them fixed promptly to prevent them from causing further damage.

Avoid extreme temperatures

Keep your Xiaomi 14 device in a temperature-controlled environment. High temperatures can cause the screen to become unresponsive, and low temperatures can cause it to freeze.

Keep the screen clean

Dirt and debris on the screen can cause it to become unresponsive. Use a microfiber cloth to clean the screen regularly.

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Reduce the number of running apps

Running too many apps at once can overload the system and cause the screen to become unresponsive. Close any apps you’re not using to free up system resources.

Use Wondershare Dr.Fone to Repair or Manage Your Data

Wondershare Dr.Fone is a helpful tool that can help manage and repair your phone’s data. It can be used to back up your data, transfer files between devices, and even fix issues like an unresponsive screen. Dr.Fone has the DF13 version to be launched, which includes more features to help manage your phone’s data effectively.

By following these suggestions, you can help prevent screen unresponsiveness on your Xiaomi 14 phone. Download Dr.Fone at https://drfone.wondershare.com/ to manage your phone’s data effectively and fix any issues that may arise.

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Conclusion

Xiaomi 14 phones offer numerous benefits, including high-quality cameras, fast processors, long-lasting batteries, and sleek designs. However, like any other electronic device, Xiaomi 14 phones can sometimes encounter issues, such as an unresponsive screen. The causes of an unresponsive screen may include overheating, physical damage, and manufacturing defects.

To deal with an unresponsive screen, users can try restarting the Xiaomi 14 device, checking the charging port and battery, or contacting a professional. Additional solutions for specific Xiaomi 14 models include checking the phone’s temperature, resetting to factory settings, or replacing a new screen. To avoid an unresponsive screen, users can check software updates on time, inspect the phone’s hardware, avoid extreme temperatures, keep the screen clean, and reduce the number of running apps. Dr.Fone is a helpful tool that can help manage and repair your phone’s data.

Authentication Error Occurred on Xiaomi 14? 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 Xiaomi 14 Wifi problem and how you can resolve whenever authentication error occurred on your device.

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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 Xiaomi 14 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 Xiaomi 14 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 Xiaomi 14 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?

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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.

Click here

![fix Wifi Authentication Error by android repair](https://images.wondershare.com/drfone/guide/drfone-home.png)

Connect your Xiaomi 14 to the computer, and select “Android Repair” in the middle.

Select all the details that match your device, and click “Next”.

Next up, you should boot your Xiaomi 14 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 Xiaomi 14 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 Xiaomi 14 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.

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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 Xiaomi 14 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.

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.

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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.

Select “WPA/WPA2-PSK”

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 Xiaomi 14 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 Xiaomi 14 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 Xiaomi 14 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.

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What To Do When Xiaomi 14 Has Black Screen of Death? | Dr.fone