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Hello @all, the solution was not to use the DE firmware but the MK firmware version. ==> DE firmware cannot downgrade from 3.12 | DE_ASUS_BC-12D2HT_3.00.bin ==> MK firmware successfully downgraded from 3.12 | ASUS-BC-12B1ST_b-3.11-WM00300-211902271321.bin MK firmware version for ASUS_BC-12D2HT in ve...

Hello @all, unfortunately I also get this error message when I try to downgrade my new internal desktop drive ==> ASUS BC-12H2FT / firmware 3.12 to firmware 3.00 in the package. It is a fresh Win11 installation, the app was started with a local admin user. With Win10 before same procedure / same err...