Now, you can directly set VSS regiser 0x7E to 0x0 and register 0x7a to 0x0 (in the same way you set register 0x258 to 0x1 to show Advanced menu) but this has no effect - UEFI boot will not work. This EFI opcode is called EFI_IFR_VARSTORE_DEVICE and it means that the setup application is checking somewhere else for a TRUE condition before showing this. This "Opcode 0x27 (2)" is a check of something in a different configuration variable store (not the "Setup" variable we are changing). Option 'Disabled' = 0x1 Flags 0x0 Key 0x0 \Help text: 'Enable/Disable UEFI Boot Function'
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