I'm trying to root a Vernee M5. I installed TWRP - which worked - and tried to use it to install Magisk - which didn't work (my guess is because of encryption?).
Now the phone always boots into recovery/TWRP and I want to install the factory ROM so I can try rooting it again.
However, using TWRP to install the ROM fails with the error:
[...] Updating partition details... Failed to mount '/data' (Invalid argument) ...done
Rebooting the device opens TWRP again.
I tried Wipe -> Format Data -> yes, which also fails:
[...] Updating partition details... Failed to mount '/data' (Invalid argument) ...done Unable to mount storage
I also tried Wipe -> Advanced Wipe -> Data -> Repair or Change File System. Changing the file system fails with the above error message. Repair also results in an error:
/sbin/e2fsck -fp /dev/block/mmcblk0p48 process ended with ERROR: 8
Some additional info: TWRP is not asking for a password anymore when booting. Internal Storage is shown as 0mb on "install", but it does still contain a folder structure. The console also shows that full SELinux support is present & MTP is enabled.
How can I fix these errors and install the factory ROM?