I believe that the problem has been triggered when my brother has tried to install the wrong rom (Mi Note 10 one) using
XiaoMiTool V2.
Of course he had an error during the installation and at that point he called me.
At that point the recovery (3.4.2b) was installed but when I tried to copy the correct rom the file transfer was hanging at around 30%. No way of copying any rome on it.
So we tried to use the
XiaoMiTool V2 restore feature for bricked phone, but after a bit it stopped saying "Flash Modem error".
So it restored the default recovery but now the phone is there and it does not seem to move from that point.
I hope there is some chance to re-life it.
Update: even trying to installing the standard MIUI 12.0.1 global using MiFlash Tool this is the result.
View attachment 32514