How to Fix the “Galaxy S21 Keeps Rebooting after Update” Issue?

Are you stuck in a boot loop? Samsung Galaxy S21 users experienced unexpected phone rebooting recently after the latest update. Recent updates cause trouble for many users, but is it normal for every S21 user, or is your device having the issue? That is also an important question to be noted. There are several reasons that your phone goes rebooting itself. But if it occurs after any latest firmware update, then it is for sure that bug issues arise in your phone.

Sometimes the latest update can introduce a bug in your phone, which gives a frustrating rebooting issue. Or it may be the newest update is not compatible with your device. In that case, you can face a software glitch, and problems like rebooting repeatedly occur. Meanwhile, you can try the below fixes to eradicate minor software glitches.

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How to Fix Samsung Galaxy S21 Keeps Rebooting Issue:

In rare cases, any hardware issue may be the root cause of the rebooting. In such a situation, visiting your nearest Samsung Service center is advisable. To confirm any hardware issue, put your phone on charge and observe. If the problem doesn’t occur, then your battery may get damaged. If the issue remains, then do check your back cover. Remove it for a few minutes and observe. Most of the time, a magnetic back cover can cause the problem. However, you must apply different tactics if it is a software issue.

We are familiar with the official major update practice. It is developed gradually after several beta testing. Therefore, your phone’s latest update might cause problems post-update. Some bug issues may remain unsolved even in the newest update. Unless any patch is available, you cannot solve the issue. Anyway, if it is confirmed that after the latest update, your phone goes crazy, then you can try the below-discussed method to resolve the issue.

Fix 1: Check your Autostart option

After a new update, if your Galaxy S21 keeps rebooting after a specific interval, then it might be that your auto-restart setting is enabled. Follow the step below to check the settings-

  • Go to settings
  • Now Go to the battery & device care / Device maintenance option
  • Now click on the option ( three dots at the top right corner)
  • Select Automation/Autorestart ( in case this option is not available, select advance and then select auto-restart)
  • Check if Auto restart at set times is enabled
  • If it is enabled, then disable it

If the Auto-Restart option is already disabled, then try the fix below.

Fix 2: Default Setting

Galaxy S21’s new update may change settings if you mistakenly agree to some popup. So it is always advisable to reset all your settings in default mode. Follow the step below to perform the reset-

  • Go to Settings
  • Select the General Management Option
  • Tap on the Reset Option
  • Click on Reset All Settings

Fix3: Enable Safe Mode and Delete Errant Apps

It is worth giving a shot and trying the SAFE Mode. In most guide posts, we advise viewers to try this method. Most of the time, any buggy application can be the root cause of the problem. By enabling Safe Mode on your phone, you can determine if any faulty application is behind the unexpected reboot. If you are familiar with these steps, then skip this method. For those who want to know how to enter the Safe mode, here are the steps-

  • Press & Hold the Power Key buttons ( You can Pull the Notification Bar (twice)  and find the power key icon)
  • Keep holding until you see the “Power off” icon,
  • Now tap and Hold the Power off icon on the screen until the “Safe Mode” icon appears.
  • Tap on the “Safe Mode” icon.

The Safe Mode label will be on your home screen, indicating your phone is in safe mode now. Enabling the safe mode, all third-party apps will be disabled. Now observe if the issue remains; if not, that is it. There is a faulty or buggy app that is causing you the problem. Please find it and uninstall the application. If you cannot escape the safe mode, follow the steps here.

Fix 4: Factory Reset

Although it can be called a fix, it is the best to resolve the problem. But before using this option, you can try the Android recovery option and clean or wipe the cache partition. Finally, you can try the Factory Reset option as a last resort. Follow the steps below to try the options in the Android recovery boot menu-

  • Switch off your Galaxy S21 phone.
  • Press and hold the Volume Up and Power Key buttons together,
  • Release the buttons when you feel a vibration
  • You will find the options Wipe cache Partition ( Use the Volume up-down button to navigate the options)
  • Press the power button to confirm the Wipe cache partition
  • Once it is done, reboot the system again

If it does not work, then go for the factory reset option. Even after all these steps, if the issue remains unresolved, you must take the help of Samsung Care Support. And hope the next security update resolves the problem.

Meanwhile, you can degrade the Android version as your phone was working correctly in the previous Android Version. Even though you could not resolve the issue, you can run your phone on the last working Android version. To do so, you can download the correct Android version. Note that your Samsung Binary version should be the same as your build number. One such reliable website where you can easily download Android files is SamFw.

That’s all for today; if you have something to ask, comment below.

With a passion for technology and a keen eye for detail in Samsung Products, Manajit's writing is always well-researched and easy to understand. When Manajit is not busy writing, he can be found sketching cartoons. Email: (Follow on X/Twitter)

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