xiaomi 8T with corrupted system

[Mizael]

hello everyone, my xiaomi redmi note 8t does not turn on or enter recovery mode or fastboot mode.
all this happened because i tried to dowgrade from miui.
I was on miui 12.5.6.0 and tried to go to 11.0.1.
the most it does is flash the screen when I connect the charger, or when I try to enter fastboot mode it shows but then it goes off again

 

[Igor Eisberg]

Then you need to bring it to a repair center. Not sure that even they will be able to fix that without an Authorized Xiaomi Account or a full motherboard replacement.