Samsung M31: Upgrade to One UI 3 (Android 11)

WARNING: Before perform firmware update, always perform phone backup! The author will NOT be held responsibility under any circumstances.

1. Settings > Software update > Download and install > Download

2. Downloading update...

3. Install now

4. Android system update > Reboot > Update (%) > Reboot

5. Phone is updating... Optimising app x of y > Optimising storage

6. Login to the phone > Finishing system update...

7. Software update > OK

URL: https://news.samsung.com/global/samsung-one-ui-3-takes-user-experience-to-new-heights-with-android-11