MIB MHI2 Discover pro problem after service action 91U9

[maros4341]

Hi All

VW MIB2 MHI2 Discover PRO installed in VW Passat B8 2017 with MU0343.
After service action 5F 91U9
Service menu is not available and firmware update is forbiden.
When try to enter service menu, display stuck on "service-modus wird gestarted"
Language change option is also forbiden and only DE language is available
Is there any way how to roll back 91U9 ?

thank you

[dec123ua]

Try update from recovery mode