BMW MGU UNIT need to repair

[eprst]

Has anyone tried to repare BMW MGU HU High D1, Harman?
the background is like this:
MGU died in a autoservis...
that is, they put it in the workshop and everything working..
We disconnected and connected the battery many times - maybe this had an effect, maybe something else is not clear,
but at one point the screen turned black, MGU diagnostics are not available
bought a new one MGU - registered and activated
the task is to repare the old one MGU
I read on the table rh850, emmc, is25lp016, is25wp064, on the dead one and on the new one
I copied everything, but the old MGU did not start...
Now I decided to connect via UART by analogy with MMI3GP
There are RX TX points, I connected them, but there is garbage in the terminal...
In general, any help is welcome

[woolenbastard]

hi, no emmc and rh850 files left? I also need mgu repair