Has anyone flashed the UEFI with 1.0.7 or 1.0.8? 

And if you have what method did you use to flash the UEFI?

Presently I'm on the original UEFI 1.0.1. 

The reason I'm asking is that I copied the 1.0.8 to a bootable Fat 32 USB and ran it with the UEFI in Legacy. It started the Flash but then I received a Run Time Error of R6000 which was a Stack Overflow. I went into the UEFI and changed back to UEFI and booted into Windows 10. 

Windows didn't seam so stable so I cloned from the 2nd drive that I have and had done a fresh clone before proceeding with the above procedure. My primary drive is a Crucial MX300 1TB SSD and the 2nd drive is the 1 TB Toshiba HDD that came with the 8920. 

The UEFI is setup so that if the UEFI does get hosed the UEFI is to recover from the UEFI recovery files on the HDD. I also have a backup UEFI 1.0.1 BIOS_IMG.rcv on this USB that could be used in a worst case scenario.  

After this Windows has been stable and working well as before starting this process. 

Thanks for any help.