Hello,
I'm with a Mi 9T (Redmi K20), under XIAOMI.EU 12.5.14 (i've the same problem under 12.5.7)
In Parameters of Miui, there is a tool to make Backup.
I can make a backup with it, it's not a problem...
But How can we restore it? I don't find button ou option "Restore"...
The only option...