Can't boot to USB?

[Devrij]

Trying to run atiflash to restore my gpu BIOS (for some reason flipping the switches hasn't changed the clocks?), but I can't boot into the atiflash usb on this pc (works fine on my gf's w7 pc)

I have made sure legacy usb is enabled. I can only select "UEFI US USB Hard drive" as the boot option though, which just loads up w8.1 normally

Help!

 

[postmanfw]

Disable "secure boot" in bios and then change the uefi boot option that appears...was shown as "csm boot" on last windows 8 pc i saw

 

[Devrij]

Disable "secure boot" in bios and then change the uefi boot option that appears...was shown as "csm boot" on last windows 8 pc i saw

I have Launch CSM set to "always". I should disable that then?

EDIT: tried that to no avail

EE: turns out it was a usb stick issue. set up atiflash on another drive and it was fine. odd.