You may have to take the laptop apart and pull the battery on the mobo.
However Im curious as to why it wont boot to the Bios? One would think if you messed with XTU, its software, so it wouldnt take effect until the OS booted. But these laptops with the HK processors, do act differently then say a desktop with XTU, at least in my experience.
I know the G703 will revert after powered off for 5mins. Have you left it off for sometime and then tried it again? That is al,so with using Rog Gaming Center. Im not sure if the same applies to changes in XTU. Good luck.
(ROG has simply become too expensive compared to the competition with same specs... 😞 )
MSI GE75 Raider 10SGS - i7 10750H - RTX 2080 Super - 32GB Ram - 1TB WD NVMe - 2TB 960 EVO - 300Hz 17inch Display
RETIRED: ALIENWARE R17 R5 - i7 8750H - GTX 1070 @ 1.9Ghz - 16GB DDR4 - NVMe 970 EVO 1TB - SSD 960 EVO 1TB
SOLD: ASUS G703VI-XH74K, RETIRED: ASUS G752VY-DH72, RETIRED: ASUS G750JH DB71 , RETIRED:ASUS G74Sx DH72