I've just updated my second Git2 and it's working normally at 2160p.
Perhaps this beta is not recognizing all the sd cards correctly to allow that resolution.
I'm just guessing.
I tested with a Transcend 32GB card, seems work well, will do more testing for 2160P mode.
Camera detects that the card can not be recorded 2196p in high bitrate, but simulate record and menu lag. I think, this wrong.
I tested 2160p at Med,Low bit-rate camera can record normal ,but only high bit-rate camera not operate.
I think this wrong ,why on previous firmware can record at 2160p High bitrate ?
@gitup