problems with rom

[Betaxxx]

Hello, I have an a21s and it's on android 12 with binary 10. I'm trying to put android 11 with binary 9 (I didn't find any rom from 11 with binary 10) but odin keeps giving a port error, it says it "can't be opened the COM port". I've done everything to fix it and I just can't. Does anyone have a solution?

 

[ethical_haquer]

Odin can be picky, try a different cable or a different port.

 

[tutibreaker]

Hello, I have an a21s and it's on android 12 with binary 10. I'm trying to put android 11 with binary 9 (I didn't find any rom from 11 with binary 10) but odin keeps giving a port error, it says it "can't be opened the COM port". I've done everything to fix it and I just can't. Does anyone have a solution?

you CANT rollback to an older binary in samsung devices will show error and your device can be bricked