h520e firmware

Hi All, I was looking into few packets received from Typhoon h520e. I can see that its using OFDM modulation, has anyone played with these and to which reference protocol it closely resemble to? Has anyone tried to sniff around with their firmwares?

just tested the new firmware on the h520e rtk. 7 back to back flights done with 2 payloads and no payload. with no payload at the location I was at the h520 rtk stayed connected and I had no control and or connection issues to the controller for the flight controls themselves. with pay loads...