Catalina - administrator is creating non ejectable disk

After the Catalina installation was nearly finished the system rebooted a short time before the status bar below the apple logo ended. Since then I stuck with every try afterwards already at "administrator is creating non ejectable disk" - see screenshot.
Whatever I try in the EFI folder the result is now the same. Any idea how to get out of this?


i9 10980
ASROCK Creator X299 (Thunderbolt TitanRidge & Aqunatia 10Gbit onboard) Bios V 1.3
RX580
256 GB Vengeance
3 x M2 (Samsung 2TB; WD 2TB...

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Author: steverayxx