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HP ProBook 455 G8 Notebook PC (1Y9H2AV)
Linux

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

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