I finally fixed and if anybody else needs help here's what I followed to fix it.
"With MiFlash I have installed official OREO version 9.5.11 after it starts normally. Activate USB Debug and reboot to fastboot again.
Download from here in Fastboot version...
I'm really desperate at this point.
I have a mi 8 se and after being on miui 10 I decided to upgrade to miui 11 through twrp and my smart ass wanted miui 12.
Let's say that didn't go as well as expected.
The phone bricked but I got it to a Chinese miui 11 rom through MiFlash but I've tried...