Question Enable UEFI/Secure Boot After Install

[purple_dragon]

I installed Windows 10 on an Asus board with Other OS enabled and secure boot off. Can I turn Windows UEFI and Secure Boot/TPM on without breaking my system? My Windows 10 boot ssd was installed using GPT not MBR.

 

[helpstar]

switch to uefi mode and just enable secure boot and tpm
evetually set the boot order correctly

 

[LinuxDevice]

Incidentally, GPT is in fact UEFI scheme. MBR is the older BIOS scheme.

 

[purple_dragon]

switch to uefi mode and just enable secure boot and tpm
evetually set the boot order correctly

So, I won't get a failure to boot by just turning it on?

 

[purple_dragon]

Incidentally, GPT is in fact UEFI scheme. MBR is the older BIOS scheme.

Yes, I knew GPT was to support UEFI, I just didn"t know if I could just enable these settings after installation without getting a failure to boot to Windows.

 

[LinuxDevice]

Yes, I knew GPT was to support UEFI, I just didn"t know if I could just enable these settings after installation without getting a failure to boot to Windows.

If Windows already uses GPT, then UEFI is already enabled. One of the tricks though is that most motherboards have the option of "pure UEFI", "pure old style BIOS", or "use whatever the disk is partitioned as" (a hybrid).

Let's say though that you are not newly installing software, and that you are going to test just to see if you can get to the Windows login prompt. If you set purely UEFI, or purely BIOS, and it fails, then you can set it back to what worked without issue. TPM though might do something unexpected; this maybe cause boot to fail, but I don't think this would write to disk or try to "fix" anything (which would result in breaking it). If you were to change TPM itself I don't know what might go wrong, but changing UEFI/BIOS momentarily will in theory be no risk (the system would boot correctly or not; that mode switch does not write to disk; what TPM changes do I cannot say, that is the wildcard).

 

[purple_dragon]

If Windows already uses GPT, then UEFI is already enabled. One of the tricks though is that most motherboards have the option of "pure UEFI", "pure old style BIOS", or "use whatever the disk is partitioned as" (a hybrid).

Let's say though that you are not newly installing software, and that you are going to test just to see if you can get to the Windows login prompt. If you set purely UEFI, or purely BIOS, and it fails, then you can set it back to what worked without issue. TPM though might do something unexpected; this maybe cause boot to fail, but I don't think this would write to disk or try to "fix" anything (which would result in breaking it). If you were to change TPM itself I don't know what might go wrong, but changing UEFI/BIOS momentarily will in theory be no risk (the system would boot correctly or not; that mode switch does not write to disk; what TPM changes do I cannot say, that is the wildcard).

Thank you, that is basically what I was trying to figure out.