Dual Bios question

[VelikiPCguy]

I have the Gigabyte X570 Aorus Master motherboard, which is a dual BIOS motherboard. Recently I had to reinstall Windows, and during that process I think the 2nd BIOS switch was selected on the MB. Now when I look at System Information > BIOS Mode, it says "Legacy", and I've also noticed the shift + restart way of getting into BIOS doesn't work anymore as I don't see the "UEFI Firmware Settings" option (it used to work before I reinstalled Windows). Also when I flip the MB to the 1st BIOS switch, it loads me up into BIOS and says "No bootable device found".

 

I therefore believe when I reinstalled Windows, the new Windows got "linked" somehow to the 2nd BIOS (which is Legacy) instead of the 1st BIOS (which is UEFI). By all accounts UEFI is the better / newer version. Is there anyway to "unlink" Windows from Legacy and switch it over to the UEFI BIOS? Or would I have to reinstall Windows again, with the 1st BIOS switch selected this time?

[RONOTHAN##]

There's a tool called MBR2GPT that will convert an old legacy style Windows install to UEFI. 

 

I do own that board though (it's the system that I'm writing this up on), and all the BIOS revisions I've used have had UEFI be default behavior. Weird that it would default to legacy boot mode. 

[VelikiPCguy]

1 hour ago, RONOTHAN## said:

There's a tool called MBR2GPT that will convert an old legacy style Windows install to UEFI. 

 

I do own that board though (it's the system that I'm writing this up on), and all the BIOS revisions I've used have had UEFI be default behavior. Weird that it would default to legacy boot mode. 

Will that have any drawbacks though? Is it safer just to reinstall Windows (I don't have anything on my PC yet so nothing lost if I do)?

[RONOTHAN##]

2 minutes ago, VelikiPCguy said:

Will that have any drawbacks though? Is it safer just to reinstall Windows (I don't have anything on my PC yet so nothing lost if I do)?

Yeah, if reinstalling is an option it's probably safer, I've seen some issues when using MBR2GPT so I wouldn't fully trust it personally. 

[VelikiPCguy]

8 minutes ago, RONOTHAN## said:

Yeah, if reinstalling is an option it's probably safer, I've seen some issues when using MBR2GPT so I wouldn't fully trust it personally. 

Got it, thank you. And if I do reinstall it with the 1st BIOS switch selected, then the system should install to that one, correct?

[RONOTHAN##]

Just now, VelikiPCguy said:

Got it, thank you. And if I do reinstall it with the 1st BIOS switch selected, then the system should install to that one, correct?

The BIOS itself should really affect the OS install, only the Legacy/UEFI option selected. I can (and have had to for one reason or another) swapped between the two BIOSes on this board with no ill affects to the OS. 

[Godlygamer23]

8 minutes ago, VelikiPCguy said:

Got it, thank you. And if I do reinstall it with the 1st BIOS switch selected, then the system should install to that one, correct?

The system isn't installing anything to any BIOS. While the OS is linked to the BIOS, it ultimately is not affected by it, so I would imagine you can just change some settings in the first BIOS, and it should be able to boot. 

 

Just to make things clear: this is likely a BIOS configuration issue, not an OS issue. 

[VelikiPCguy]

6 minutes ago, Godlygamer23 said:

The system isn't installing anything to any BIOS. While the OS is linked to the BIOS, it ultimately is not affected by it, so I would imagine you can just change some settings in the first BIOS, and it should be able to boot. 

 

Just to make things clear: this is likely a BIOS configuration issue, not an OS issue. 

So what can I do in the first BIOS since it's telling me "No bootable device found"?

[Godlygamer23]

18 hours ago, VelikiPCguy said:

So what can I do in the first BIOS since it's telling me "No bootable device found"?

Check to make sure everything is in the right order where your boot devices are, and if they don't show up, check "Hard Drive BBS Properties".