Trying to upgrade to Windows 11 - Arrrghhh CSM

kirkster

kirkster

kirkster

Associate
Joined
14 May 2007
Posts
843
Location
London
Been trying for about three hours and I have built a ton of computers before.

Gigabyte Z370 gaming 7 OP (rig is in sig) - latest F15 firmware from Nov 2021. System already has legacy mode enabled with Windows 10 and it all works perfectly.

Every bit of reading I have done suggest all I need to do is as follows.
Disable CSM. Reboot.
Enable Secure Boot. Cool.
Enable Intel TPM 2.0. All good.

PC will not boot off of my pre-made Win7 USB disk - it sees it but when I try to boot off it the system does not even try and instantly goes back to BIOS setup. It also fails to see the SSD drives (Samsung 970 Pro). It sees the UEFI USB boot disk but just can't boot off it. Other PC's (and this PC if I revert) boot fine from it. I expected to be able to see the bootable disk and then I'd reinstall and reformat the SSD to GPT but I cannot get that far.

Disconnect all other peripherals and same issue. Re-enable CSM and it all works again.

Any thoughts please? Does the USB itself have to be GPT partition in order for it to be bootable once CSM disabled? If so how to do that?
Homebuilt rig is only three years old so I cant believe it is incapable of running Windows 11.

  • Thanks, Steve
 
Last edited:
Creating the GPT bootable Windows USB boot disk right now with Rufus.
When I (if I can) boot with this and reinstall Windows 10 - as first step to upgrade to windows 11 - I hope that it will give me the option to select the GPT on the SSD prior to formatting it.
 
Confirmed. System finds the GPT partitioned USB boot disk and off I went. Nowhere is this mentioned that the boot disk needs to be GPT. Windows 10 installed and is now upgrading to 11 :)
Many thanks for assisting :)
 
you could have just downloaded windows 10 USB image and used that, no serial needed since its already activated
 
You must log in or register to reply here.
Back
Top Bottom