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ROG GU501GM Legacy BIOS unavailable

Level 7
I'm trying to get this laptop to boot off a USB stick to install Windows 10 on a MBR SSD.
It boots up and the windows setup starts but stalls at the partition drive screen saying on EFI BIOS windows must be installed on a GPT drive.
I have been successful at this on other laptops, but on this one, even though I can disable secure boot, it's not booting in legacy BIOS mode to allow me to install windows 10 on this SSD. For encryption purposes I cannot use at GPT drive. I've just installed the latest BIOS. No help. There is no drop down in the BIOS to choose an OS. Any help would be greatly appreciated. Thanks.