having backup userdata partition with adb pull but can not use it

[dahikino2]

i need help to be able to extract data from my backup of my xiaomi mi 10T Pro, i did backup the userdata partition with adb pull (connected with usb to the phone under twrp recovery) :

adb pull /dev/block/bootdevice/by-name/userdata xiaomi_mi10tpro_userdata.img

Now i have the backup partition image file but i can not extract data.
I have the password of the phone (that is in bootloop)

i'm under linux or ii can be under windows.

some test i did :

❯ LANG=C sudo mount -o loop -t f2fs userdata.img /mnt/xiaomi_mi10tpro_userdata
[sudo] password for root:
mount: /mnt/xiaomi_mi10tpro_userdata: wrong fs type, bad option, bad superblock on /dev/loop38, missing codepage or helper program, or other error.
dmesg(1) may have more information after failed mount system call.

i don't know if the data are supposed to be encrypted or not? i was under twrp recovery, password entered before i began to launch the command adb pull.


Can you give me some helps ?