Yep 210 seem to be the optimum for the G 75 that came with Win 7, I have no problems running Win 8.1 on BIOS 210 also! I may be missing out on something I don't know, if so I haven't found what that may be yet.
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro