So, I wanted to install Lineage OS on my MI 9T Pro and I've made a mistake (I know why.)
I've use TWRP to access to recovery, I'll erase all folder (system/data/vendors/cache) and I'm trying to install lineage, but my OS folder was in a folder into my zip and an error was occured.
In the panic, I've rebooted the phone, and a message "The system was DESTROYED" appears on my screen, but I've access to Fastboot. I've trying some Fastboot erase (Data/system (no access)/Boot/cache) AND !
I've lock by mistake my phone with a Fastboot oem lock, but I succeeded to unlock it with Mi software.
I'm trying an Fastboot devices, all are okay I've a device connected, but, if I try an adb devices i don't have devices connected.
I have push a miui folder (~90mb) in boot, and now it restarted only in Fastboot mod, no other message, no other possibility. and I've tried a reboot in recovery, nothing, same in "android OS mod", only Fastboot reboot.
I've trying to flash with MiFlash a global rom but error 0xfffffff has occurred.
Today, I'm totally stuck and I don't know what to do, I don't have backup for a potential restoration.
Impossible to have access to debug mod to my Mi 9T Pro because I don't have access to OS and developer mod.
Apparently the battery is charging (always ON) with USB.
If u have some tricks for me, it's with pleasure!