How to Fix Android App Not Installed Error on Nokia XR21 Quickly?

App not installed on Android is no more an unknown Error Code during Application installation as many people experience it on a day-to-day basis. An “Application not installed” error message usually pops up when you are trying to download and install an App with a .apk file extension from somewhere other than the Google Play Store. The error is very confusing at first but makes sense when you realize that this unknown Error Code during Application installation is neither a software issue nor a hardware problem. It is a direct outcome of what you do with your device. Yes, you heard that right. Your faulty actions can cause Android App not installed error.

What to do when trying to install the Android APK it says “app not installed”? It is terrible that you can’t install App on your device. But in this article, you will know more about the causes behind this error and the best ways to fix it, read on, here is all you need to know.

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## Part 1: Common reasons for the “Android App not installed” error

You may ask: Why can’t I download apps on my Nokia XR21? Understanding the underlying causes of the “Android App Not Installed” error is crucial for resolving the issue effectively. So, what are the reasons for Android App not installed error? Given below are a few reasons:

1. Insufficient storage

Android software and if data such as photos, videos, music, messages, apps, contacts, emails, etc are stored in the internal memory there is not adequate storage left for another App, leading to Android App not installed error.

2. Corrupted/Contaminated App file

When you do not download Apps from the Play Store and choose another platform to do so, App files are usually corrupted and hence cannot be installed on your device smoothly. You should be doubly sure of the source from where you download an App, check its extension name, and make an effort not to install contained files.

3. SD Card not mounted in the Nokia XR21 device

At times your phone could be connected to your PC or another electronic device that can access the SD Card from your device. In such situations when you install an App and choose to save it to your SD Card, you will see Android App not installed error because the App cannot find the SD card as it is not mounted in your device.

4. Storage location

You must be aware that certain Apps work their best when stored in the Nokia XR21 device’s internal memory, whereas others need to be located on an SD Card. If you do not save the App in an appropriate location, you will find that the App isn’t installed because of an unknown Error Code.

5. Corrupt storage

Corrupted storage, especially a corrupted SD Card, is known to cause the Android App isn’t installed error. Even the internal storage can get clogged due to unnecessary and unwanted data, some of which might contain an element that disturbs the storage location. Take this issue seriously as a corrupted SD Card and even clogged up internal memory can put your device in danger.

6. Application Permission

Software operations running in the background and App Permission are not new concepts. Such errors can also cause the Unknown Error Code during App installation.

7. Incorrect file

If you already have an App installed but download another variant of it having a distinct signed or unsigned certificate can also make the Android App not installed error pop-up. This sounds technical, but this and all the other reasons listed above can be tackled by you.

The Unknown Error Code during Application installation can occur due to any one or more of the reasons stated above. So read them carefully and understand them well to avoid such glitches in the future.

Part 2: One-click to fix App not installed on Android error

So App not installed on your Nokia XR21 or tablet? The most horrible part is that this issue may come out of the corruption in the system files. In this situation, Android apps won’t be installed no matter what measures you take. Android system repair is the only effective solution to deal with this issue.

Android system repair used to require high technical skills. But most of the users know little about technical things. Well, worry not! Dr.Fone - System Repair (Android) allows you to repair Android easily, that is, complete the fix with just one click.

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A powerful tool to fix the “Android App not installed” error in one click

• Fix all Android system issues like Android App not being installed, the system UI not working, etc.
• One-click to fix Android App not installed. No technical skills are required.
• Support all the new Nokia XR21 devices, etc.
• On-screen instructions are provided to prevent any misoperation.

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Note: Getting your Android system repaired may erase the existing device data. It is recommended that you should back up your Android data before starting the Android repair.

The following steps illustrate how to fix the “Android App not installed” error in one click:

1. Install Dr.Fone on your Windows. After that, launch it, and click “System Repair”. Connect your Android to the computer.

2. Select the “Android” option and click “Start”.

3. Select device information, such as brand, name, model, country, etc., from each field, and type “Next”.

4. Follow the on-screen instructions to boot your Android in download mode, and allow the tool to download the firmware to your device.

5. After the firmware is downloaded, the tool will start to repair your Android, hereby fixing the “Android App not installed” error.

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Part 3: How to fix App not installed error on Android

We understand that it can be a tricky situation to be in when Android App not installed error pops up, but what if we tell you can get rid of it in easy and simple steps? Yes, there is!

#1. Delete unnecessary files/Apps

Insufficient storage can prevent the app from being installed. Make some storage space on your device by cleaning unwanted data and deleting extra media and other files. You can also get rid of heavy Apps by:

Visiting “Settings” on your device. Then select “Manage apps”, “Application Manager” or “Apps” (varies based on device model or version) from the list of options before you.

Now select the App you wish to uninstall and wait for the App Info screen to open, then click on “Uninstall” as shown in the screenshot.

You can also uninstall the unnecessary application on the home screen, just long-press the app you want to uninstall until you see the “uninstall” icon. Click “Uninstall”, then, you need to click “OK” to confirm the uninstall process.

#2. Use only Google Play Store

As you are all aware, the Play Store is specially designed for Android software and contains only trusted and safe Apps. It is often known as the “Android Market” because it is loaded with different types of Apps to stiffly all your needs so that you don’t have to rely on other third-party sources to purchase/install Apps.

#3. Mount your SD Card

Another remedy for Android App not installed error is to make sure that the SD card inserted in your device is not inaccessible.

To check the same:

First, disconnect your Nokia XR21 from your PC and then visit “Settings” on your Android and select “Storage” from the options that appear. Finally, click on “Mount SD Card” at the Storage Info screen.

You can now restart your device and try to install the app now, it should work!

#4. Choose App location wisely

It is advisable to not tamper with the App’s location and let the software decide where it needs to be placed. As far as possible, let the Apps be in your device’s internal memory.

#5. Format SD Card

The chances of your SD Card being corrupted are very high. You can format it either while it is in your device or externally.

Now to Clean up your SD Card, simply visit “Settings” and select “Storage” and tap on “Format SD Card” and mount it once again to use it smoothly.

#6. App Permissions

You can reset App permissions to combat the Android App not installed error by Visiting “Settings” and then selecting “Apps”. Now access the Apps menu and hit “Reset App Preferences” or “Reset application permissions”. This will allow third-party apps to get installed on your device.

#7. Choose the correct App file

Make sure to always download an App file only from a trusted and safe source to avoid any errors during installation.

#8. Reboot your device

Finally, if nothing else works, restart your device to end all operations which could be causing the said error. To reboot, just press the power button till you see a pop-up. Select “Restart” and wait for your device to reboot.

Conclusion

Encountering the “App Not Installed” error on Android can be frustrating, but by understanding the causes and implementing the appropriate solutions, you can overcome this issue. We saw that Android App not installed error can be fixed quickly if you keep in mind the tips given in this article. However, please ensure that you follow each instruction carefully to avoid any further goof up.

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Nokia XR21 Camera Not Working Unexpected Error? Fix It Now

For all its glory and goodness, the Android OS often has its users pulling their hair in frustration at just how buggy the OS can be at times. So, if you’re having one of those days today, we are here to help. Camera app is one of the most used apps on smartphones today. People only launch the app when they want to take a photo, for everything else there’s a dedicated photo gallery app. What happens when you launch the camera app only to realize it threw an error and you missed your photo moment? Don’t throw the phone, not yet. Let us help you out.

Part I: Why Is Android Camera Not Working?

There are a few reasons why the camera app is not working on your Nokia XR21.

Low Memory

Camera app does rely heavily on system resources, so in case you have too many apps open and for some reason the OS is not able to manage the resources appropriately for the camera app to function as it should, you will get a camera error.

Low Storage

The camera app needs storage space to save the photos it takes. So, in case your phone is running low on storage space, the camera app would likely malfunction as it would have no way to store the photos it would be taking.

General Bugs And Glitches

OS bugs and general glitches within the OS and the camera app can cause camera not working issue anytime during everyday operation. This is part and parcel of any technology.

Hardware Issues

In the rarest cases, there might have developed an actual hardware issue with the camera system on your Nokia XR21. The likely culprit is misuse and abuse, such as a dropped phone or maybe the phone was too hot for extended periods of time, causing hardware issues.

Part II: How To Fix Android Camera Not Working Issue?

So, how to get the Android camera not working problem solved? There are a few ways you can try fixing the camera not working issue on your Nokia XR21 right where you are, without needing to take the Nokia XR21 device to the manufacturer’s service center.

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II.I: Restart The Handset

One of the first things to do any time an app or your phone or tablet does not work like it should, restarting the Nokia XR21 device refreshes everything just enough to resolve most commonly occurring issues.

Use the power button on your smartphone to restart your Android handset and see if this resolves the issue.

II.II: Close And Relaunch The Camera App

If the camera app (or any app for that matter) has been in the background for a while and then it is brought to the foreground, there are always chances of it crashing for any reason, or not working as expected. So, closing the app completely and relaunching it is recommended.

Step 1: Launch the app switcher on your specific Android device the way your device manufacturer suggests you to. Usually, it is a swipe up and hold gesture to get into the app switcher.

Step 2: Next, you can choose to close just the camera app or, better yet, close all apps by tapping the Close All button. Flicking any app upwards (quick upward swipe) is how you close an app. If there is no Close All button anywhere, repeat the gesture for all open apps.

II.III: Check App Permissions

These days, thanks to strides in the privacy initiatives, apps need permissions before they can function the way they do. Most of the times, apps such as camera do have the necessary permissions, but sometimes it is possible that the permissions are set incorrectly. To check if the camera app has the requisite permissions, do the following:

Step 1: Go to Settings > Apps > Camera > Permissions.

Step 2: Tap Camera.

Step 3: See if the selected option is Allow Only While Using This App. If not, select it.

II.IV: Clear The Camera App Cache

Clearing the camera app cache is sometimes helpful. To do that:

Step 1: Go to Settings > Apps > Camera and tap Storage Usage.

Step 2: Tap Clear Cache.

II.V: Clear The Photo Gallery App Cache

The camera app is closely tied to the photo gallery app that comes baked in into Android OS. That is because photos that the camera app takes are stored in the photo gallery app. Consequently, if there were any issues in the photo gallery app, that could lead to the camera app not working on Android problem. Here’s how to clear the photo gallery app cache:

Step 1: Go to Settings > Apps > Photos > Storage Usage.

Step 2: Tap Clear Cache.

II.VI: Check For App Updates

This does not happen always, but sometimes, with known bugs and issues, there may be an update released that fixes those bugs and issues that prevent some users from using a given app reliably. Checking for updates is a good step to make sure that your camera app is updated to the latest version possible.

Step 1: Go to Play Store and tap your profile picture on the right.

Step 2: Tap Manage Apps and Device.

Step 3: If there are updates available, Tap Update All to update all apps.

II.VII: Cool The Phone Down

We do not realize the immense power that is packed into the thin smartphone form factor these days. If you have been using the phone to video chat for a while now, you might not realize that the phone has become hot, especially if you are using a desk stand. Same for shooting high-resolution videos; the phone does get quite hot shooting high-resolution videos.

If this is the case, close all apps and let the phone cool down. You might even want to shut the phone off to help cool it faster.

II.VIII: Nudge The Camera System

You may want to tap your camera system (the lenses and surrounding area) gently to see if that gets the camera working. In case it did, this is indicative of a hardware issue, and you should get it checked at the service center at your earliest convenience.

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II.IX: Fix Android Camera Not Working Issue In One Click (With Dr.Fone)

Now, if the above fixes have not worked, you might want to repair your Android OS once before you make that appointment with the service centre. And, we have just the app to help you fix your camera not working on Android problem quickly.

Wondershare Dr.Fone is a multi-module app that works on both Windows and macOS and is the only app you will ever need to resolve nearly all of your smartphone and tablet issues that you are likely to encounter. Need to take backups? Dr.Fone Phone Backup has you covered with the ability to take and restore even selective backups, and to any location such as your computer or an external disk as well. Want to transfer WhatsApp chats to a new phone? Use WhatsApp Transfer to do just that! Bought a new phone? Use Phone Transfer to transfer contents from old phone to new, and then use Dr.Fone Data Eraser to securely wipe your old phone before giving it away!

Today, we will use Dr.Fone’s System Repair (Android) module to fix Android camera not working issue quickly.

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Step 1: Launch Dr.Fone app on your PC or Mac.

Step 2: Click System Repair module and then Android.

Step 3: For now, don’t bother with the scenarios given and click Start to go to the next screen.

Step 4: Your Android device will be detected by Dr.Fone. If anything seems incorrect, use the dropdown options to change it, and click Next.

Step 5: Your phone needs to be put into Download mode before it can be repaired. Follow the instructions shown onscreen and click Next.

Step 6: Dr.Fone automatically downloads the most recent firmware for your device and when it is ready, waits for your input. Click Fix Now to start the repair process.

Step 7: You will need to enter a 6-digit code (digit zero, six times – 000000) to confirm and begin the repair process.

When the repair is complete, Dr.Fone shows the final screen as below:

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Conclusion

The camera app on your smartphone is one of the most important apps you use. This is not a game; this is an app that makes previous memories possible for you. So, when you get any of those incorrigible errors that are impossible to make sense of, what do you do? This guide gives you 9 fixes to fix Android camera not working error quickly and easily.

Simple Solutions to Fix Android SystemUI Has Stopped Error For Nokia XR21

In this article, you will learn possible causes of Android SystemUI stopping error and 4 methods to fix this issue. Get Dr.Fone - System Repair (Android) to fix Android SystemUI stopping more easily.

Android SystemUI isn’t responding or Android, unfortunately, the process com.android.systemui has stopped is a not a rare error and is observed in all Android devices these days. The error usually pops up on your device while you are using it with a message on the screen saying Android. Unfortunately, the process com.android.systemui has stopped.

The Android SystemUI isn’t responding error message may also read as “Unfortunately, SystemUI has stopped”.

Android SystemUI error can be very confusing as it leaves affected users with only one option, i.e., “OK”, as shown in the images above. If you click on “OK” you will continue to use your device smoothly, but only until the SystemUI isn’t responding error pops-up on your main screen again. You may restart your device, but the Android SystemUI has stopped the problem continues to annoy you until you find a permanent solution for it.

If you are also among the various users who see Android, unfortunately, the process com.android.systemui has stopped error, then do not worry. SystemUI isn’t responding. Error is not a serious issue and can be tackled easily by carefully examining the reasons behind the problem.

Looking for suitable solutions to fix Android SystemUI has stopped error? Then read on to find out all about Android SystemUI isn’t responding error and the most effective ways to fix it.

Part 1: Why Android SystemUI Has stopped happens?

Android device owners would agree that OS updates are very helpful as they fix the bug problem and improve the overall working of your device. However, sometimes these updates may be infected due to which they do not download and install properly. A corrupted OS update may cause Android; unfortunately, the process com.android.systemui has stopped error. All Android updates are directly designed around the Google App, and thus, the problem will persist until the Google App is also updated. Sometimes, even the Google App update may cause such a glitch if it is not successfully downloaded and installed.

Another reason for the Android SystemUI isn’t responding error to occur, maybe because of flashing a new ROM or due to improper firmware update installation. Even when you restore the backed up data from cloud or your Google Account, such Android, unfortunately, the process com.android.systemui has stopped error may show up.

It is not possible to say for sure which one of the above-mentioned reasons is causing your device to show Android SystemUI is not responding error. But what we can do is move on to fixing the Android SystemUI by following any one of the three methods given the following segments.

Part 2: How to fix “com.android.systemui has stopped” in one click

As we’ve learned that Android system UI isn’t responding issue is primarily because of the Android OS updates not installed properly or were corrupted. Hence, there comes the need for a powerful Android system repair tool that can help you rectify such annoying errors.

To serve the purpose, we would like to introduce, Dr.Fone - System Repair (Android) . It is one of its kind of applications and is highly recommended as it has a proven success rate to resolve almost all Android system issues.

It’s now time to understand how to fix Android ‘unfortunately, the process com.android.systemui has stopped’ or in simple words, Android system UI isn’t responding.

Note: Before we proceed to Android repair, please ensure to make a backup of all your data . This is because the Android repair process may wipe out all the data on your device to fix the Android OS issues.

Phase 1: Connect and prepare your Nokia XR21

Step 1 – Download the Dr.Fone toolkit over your PC. Install it and launch it over. Opt for the “System Repair” tab from the main screen and get your Nokia XR21 connected to the PC.

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Step 2 – You need to select “Android Repair” from the left panel and then hit the ‘Start’ button.

Step 3 – Next, you need to select the correct information about your device (i.e., brand, name, model, country/region, and carrier details). Check the warning down below and hit “Next”.

Phase 2: Boot Android in ‘Download’ mode to perform the repair.

Step 1 –You’re now required to boot your Android in Download mode. Here’s what you need to do to put your Android in DFU mode.

If your Android has a Home button:

• Turn off your device. Hold down “Volume Down + Home + Power” buttons altogether for about 10seconds. Let go of the buttons afterward and hit the Volume Up to boot in download mode.

In case your Android has no Home button:

• Turn off your device. Hold down “Volume Down + Bixby + Power” buttons altogether for about 10seconds. Let go of the buttons afterward and hit the Volume Up to boot in download mode.

Step 2 – Once done, hit “Next” to initiate the downloading of the firmware.

Step 3 – As soon as the download completes, the Android repair will automatically be started by the program.

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Step 4 – In a just a matter of a few minutes, your Android system UI isn’t responding issue will be resolved.

Part 3: Uninstall Google updates to fix Android SystemUI issue

All Android SystemUI isn’t responding errors are circled the Google App as the Android platform is heavily dependent on it. If you have recently updated your Google App and the Android, unfortunately, the process com.android.systemui has stopped error keeps popping up at regular intervals, make sure you uninstall Google App updates as soon as possible.

Follow the steps given below to fix the Android SystemUI has stopped issue by rolling back the Google App updates:

• Visit “Settings” and select “Apps” or “Application Manager”.
• Now swipe to view “All” Apps.
• From the list of Apps, select “Google App”.
• Finally, tap on “Uninstall Updates” as shown hereunder.

Note: To prevent the Android SystemUI isn’t responding error to occur in the future, do not forget to change your Google Play Store settings to “Do Not Auto-Update Apps”.

Part 4: Wipe Cache partition to fix Android SystemUI error

Android, unfortunately, the process com.android.systemui has stopped error can also be fixed by clearing your cache partitions. These partitions are nothing but storage locations for your modem, kernels, system files, drivers, and built-in Apps data.

It is advisable to clear Cache portions regularly to keep your UI clean and free of glitches.

Android SystemUI isn’t responding error can be overcome by clearing the cache in recovery mode.

Different Android devices have different ways to put it in recovery mode. Refer to your device’s manual to enter the recovery mode screen on your device and then follow the steps given below to fix Android; unfortunately, the process com.android.systemui has stopped error by clearing the cache partition:

• Once you are the recovery mode screen, you will see several options as shown in the screenshot.

• Use the volume down key to scroll down and select ”Wipe cache partition” as shown below.

• After the process is completed, select “Reboot System” which is the first option in the recovery mode screen.

This method will help you de-clutter your device and erase all the clogged up unwanted files. You may lose App related data too, but that is a small price to pay to fix the Android SystemUI isn’t responding error.

If the Android SystemUI has stopped the problem persists, there is only one way out. Read on to find out about it.

Part 5: Fix Android SystemUI error by factory reset

Factory Resetting your device to fix Android; unfortunately, the process com.android.systemui has stopped error is a desperate measure and should be the last thing to do on your list. Take this step only when the above mentored two techniques fail to work.

Also, make sure you take a back-up of all your data and contents stored in your Nokia XR21 on the cloud, Google Account or an external memory device because once you perform a factory reset on your device, all media, contents, data and other files are wiped out, including your device settings.

Follow the steps given below to factory reset your device to solve the Android SystemUI isn’t responding problem:

• Visit “Settings” by clicking the settings icon as shown below.

• Now select “Backup and Reset”.

• In this step, select “Factory data reset” and then “Reset Device”.
• Finally, tap on “ERASE EVERYTHING” as shown below to Factory Reset your device.

After the factory reset process is completed, your device will automatically restart, and you will have to set it up once again.

The whole process of factory resetting your Nokia XR21 might sound tedious, risky, and cumbersome, but it helps to fix the Android SystemUI has stopped error 9 out of 10 times. So, think carefully before using this remedy.

Android SystemUI isn’t responding or Android, unfortunately, the process com.android.systemui has stopped error is commonly seen by users on their devices. It is not a random error and is linked to either the software, Google App, cache partition, or data stored in the Nokia XR21 device. It is fairly simple to deal with this issue as all you need to do is install or roll back your Android OS update, uninstall Google App updates, clear cache partition, or factory reset your device to clear all data, files, and settings stored in it. The methods listed and explained above are the best ways to fight the problem and to prevent it from troubling you in the future. These methods have been adopted by affected users all over the world who recommend them because they are safe and involve minimum risks as compared to other tools to solve the Android SystemUI has stopped error. So go ahead and try them now!