I am super frustrated that I can't get my USB boot image to authenticate on an HP z840.
I have created a BIOS admin password, enabled legacy boot/disabled secure boot, tried to clear secure boot keys (which never saves in settings), and tried a host of BIOS settings changes. Secure boot always tells me "selected boot image did not authenticate."
I have read that some users have had this issue and had to send back their machines because its a motherboard issues. Please help!