Yesterday i updated my phone to android 12 one ui 4.0. 1 hour after updating my phone (s21 ultra) screen got blanked for 24 hours but phone is functional. After 24 hours it is functional again. Don't know if it is a bug or something....
Ur phone got into an update error,in which it didn't recover from update n most probably it resolved itself without ur intervention. Sometimes phones do get into such errors n a quick reset would solve most of such issues.😊☺️
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