I flew in an FAA Authorization zone set at 200 feet with FAA LAANC permission with my Mav 3 Pro, Avata 2 and Mini 4 Pro. My Mav 3 would go to 151 feet, no more. My Mini would go to 200 feet and my Avata 2 could go above that if I allowed it. All three drones would allow me to fly to different altitudes. All had an excellent GPS lock - like 31 satelliltes or some such number - and all had their Max Altitude set to 400 feet or more. All have current firmware and the most recent Flysafe database as confirmed by DJI support. DJI is clueless and suggest I ask the FAA why they are limiting my drone (they are not, I'm sure). Apparently my DJI Mav 3 knows it's in an authorization zone and won't fly over 150 feet for no particular reason. I even redownloaded the firmware via my computer. No change. voodoo magic, baby.
