@MrT10001 ok it works! i'm on ubuntu touch.
I think I didn't tick "wipe data" on first install

thank you for help !

@MrT10001 ok it works! i'm on ubuntu touch.
I think I didn't tick "wipe data" on first install

thank you for help !

@MrT10001 thank you. i'm testing new installation

hello,

to tried to install ut
I followed the steps : downgradind to android 10.5.2 with the file .zip. (done with windows pc with msm download tool)
unlock oem and usb debug.
i start with ubport installer- everything seems good BUT at the end, my phone blocked.
i don't really remember the sentence, it was like "bootloader is unlock...danger"...
i pressed volum up + power on
and now the screen is :

fastboot mode
product_name - bengal
variant - sm_ ufs
bootloader version -
baseband version -
serial number - ab0b9013
secure boot - yes
device state - unlocked

phone propose to choose beetween start/ power off /recovery mode/ restart bootloader but, nothing works

on pc, "fastboot devices" says "ab0b9013 fastboot
"adb devices" doesn't work

can anyone help me?