I have a Xiaomi Redmi Note 9 (128GB/4GB RAM). I have unlocked my bootloader. Then I tried to install TWRP. I got into the fastboot mode, then executed:
fastboot flash recovery [file].img
fastboot flash vbmeta [file2].img
fastboot flash misc [file3].bin
or something like it. And when I push the volume(-) and power buttons while rebooting, it just reboots into the Xiaomi logo, again. I can not even turn it off.
Now, it is stuck on a bootloop showing the Xiaomi logo. I am unable to boot into the bootloader. When I connected it to the PC and tried to boot into the bootloader -with no success-, the PC made the sound of something being connected but it quickly made the sound of something being disconnected.
What should I do?
Note: I am a complete newbie in this.
I went to different repair shops and they told me it needs software or worse a new ROM.