How to disable secure boot asus z390. Plug a usb drive into the pc. I did finally find out how so thought i would share this with the forum in case some one else had the same problem. Launch the start menu and select restart from the power menu.
Select save secure boot keys and press enter. Select secure boot and change the os type setting to other os to disable secure boot. Press f7 or another designated key to enter the advanced mode section of the bios.
Four key files named pk kek db and dbx are saved to the usb. I thought after i had asked how to disable secure boot with asus tuf z390 plus gaming wifi that no one had answered the question. When your computer starts booting press del on the keyboard or another assigned key to enter bios.
To disable the uefi secure boot. Select the usb drive when asked to select a file system. Delete the platform key pk to disable secure boot note not to delete other keys.
4 keys named pk kek db and dbx will be saved to the usb drive. Select the usb drive when asked to select a file system. Select save secure boot keys and press enter.
Hit the esc key to return to the previous boot menu screen. Delete platform key pk to disable secure boot.