Recent update - Can no longer do 4K 120HZ

Since the recent updates, bios, VGA etc I can no longer do 4K output at 120hz, I can do 60Hz but selecting 120 and it just goes black. 

This was working just 2 weeks ago. My TV is the LG C2 and I heard they are sensitive with what is connected but because it was working I feel something has changed on only the Legion Go.

I have tried all different combinations of 444, 422, 10 bit, 8 bit etc.

I have tried a dock and a standalone cable, there is not a lot of options to test with in this category for this bandwidth however.