cant boot anymore install medium – HP Support Community

hi there

i cant boot anymore from usb. not with cd rom or usb stick. get this error:

Failed to open \EFI\BOOT\mmx64.efi – Not Found Failed to load image \EFI\BOOT\mmx64.efi – Not Found Failed to start MokManager: Not Found Something has gone seriously wrong: import_mok_state() failed : Not Found

tried for hours all configurations in bios, disable secure boot,…..to no avail. Help please.

Best regards