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Question Is there a guide on how to downgrade to android 11 and one ui 3.1 after Android 12 and one ui 4 garbage?

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Senior Member
May 4, 2011
Samsung Galaxy S21+
Looking to revert back to android 11 and need to know what to do to not brick my phone.

Currently have an unlocked galaxy s21 plus, Odin is installed and so is a 4 file firmware package for Android 11..

I have USB debugging checked and most things backed up before I perform a factory reset..

Is there anything else that I'm missing, am I completely wrong? Sorry, it's been a long time since I've done anything like this


Senior Member
Jun 23, 2020
As long as it wasn't a OTA upgrade that also updated the bootloader version you should be able to roll back.
Make sure all critical data is redundantly backed up. Verify it's all there and readable.


Senior Member
Jan 1, 2013
So did you succeed in this?

Edit: It's downgradeable ez pz. Just download the latest Android 11 and flash via Odin. I have the Exynos version.
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