How to Unbrick the Galaxy S21 & Return to Stock Firmware

If something goes wrong and your Samsung Galaxy S21 series phone is in a bootloop then I can help fix the bootloop using the program called Odin. This will reset the whole smartphone and let you boot back into stock One UI Android.

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Whether you have installed a root mod that is incompatible (or has a bug) with the Samsung Galaxy S21 Ultra. . .or maybe you simply just installed an OTA update and had a bug break Android.

There are many things that can cause your smartphone to no longer boot into the Android OS. When the phone tries and fails, it will either continue to try (resulting in what is known as a boot loop within the community) or force you into either Download Mode or Recovery Mode.

If you're experiencing this, that means there's something wrong with the Android filesystem (missing files, corruption, a nasty bug, etc). I can't help save your personal data but I should be able to get your Galaxy S21+ working again.

We first try to simply perform a factory data reset while the phone is in Recovery Mode. If you're not automatically sent here then I show you how to manually boot the Galaxy S21 into Recovery Mode using the USB cable and the button combination as required.

This should solve the issue for most people but there are some instances where you may need to take things a step further. If things are really bad, we'll need to use Odin to manually flash the firmware images (similar to using fastboot tools).

We can do that by first booting the phone into Download Mode and then connecting it to the PC with a USB cable. When we open up the Odin program, that should automatically detect the phone.

If it doesn't, then you'll need to troubleshoot the USB-related issue you're experiencing.

But if it does, then we can continue by downloading the Samsung firmware we need (I use Frija right now, but some use SamFirm, others use SamMobile or Updato, etc.).

Once extracted, we can plug in 4 of these firmware files into Odin so it can flash them onto our smartphone. The process should only take a few minutes and will cause your device to reboot when it finishes.

If all things went smoothly, you'll see the Android activation screen after sitting at the boot logo for a few minutes. Be patient, the phone should no longer be stuck in a bootloop and will be fixed.



Mentioned Links
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Download Samsung Firmware -    • How to Use Frija to Download Official...  
Find Your CSC Region Code -    • How to Find the Samsung Galaxy Smartp...  
Galaxy S21 Download Mode -    • How to Boot the Galaxy S21 in & out o...  
Galaxy S21 Recovery Mode -    • How to Boot the Galaxy S21 to Recover...  
Odin Download - https://www.androidfilehost.com/?fid=...



Full Tutorial
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1. Intro [00:00]
2. First try booting into Recovery Mode [02:40]
3. Then perform the Factory Data Reset [03:19]
4. And reboot back into the Android OS [04:40]
5. And activate Android like normal [06:40]
6. If that to fix the issue, then boot into Download Mode [07:32]
7. Open up Odin [08:12]
8. Download and extract your firmware
9. And load the 4 files into Odin as shown [09:55]
10. Then click the Start button at the bottom [12:57]
11. Wait for Odin to flash the firmware files [13:49]
12. Watch the phone reboot [14:33]
13. And activate Android like normal [15:23]



The Gear I Use
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5W Amazon Charger - https://amzn.to/2OaUMV8
MicroUSB Cable - https://amzn.to/38dkpeM
USB-C Cable - https://amzn.to/2OqlTvi
TPU Cases - https://amzn.to/38g9b9w