Yesterday, I used the Xiaomi Mi 9 SE
Updater app to update my EMUI version. After downloading the update zip file (2.8GB), the app warned me that it would "install the update, start in recovery mode and will ask for my password as the file system was encrypted" (I don't remember the message exactly).
The phone rebooted and got stuck on the Fastboot screen for more than a hour.
After that I rebooted multiple times with different ways (hold power button, hold power button + volume down, and hold power button + volume up and down) but just after the reboot it gets stuck on the Fastboot screen again.
I tried using the Android platform tools to try to reboot it but the result is the same, always stuck on the Fastboot screen.
$ sudo ./fastboot devices
$ sudo ./fastboot reboot
Rebooting OKAY [ 0.000s]
Finished. Total time: 0.351s
$ sudo ./fastboot reboot recovery
Rebooting into recovery OKAY [ 0.000s]
Finished. Total time: 0.352s
Do you have any solution to fix ? If not, is it possible to do a factory reset ? I have backups for my data so no problem for me.