I reverse engineered a part of the firmware on the (then new) Vortex 150 racing quadcopter. There were 3 different SKUs as i recall, i had the EU version with 2

I reverse engineered a part of the firmware on the (then new) Vortex 150 racing quadcopter. There were 3 different SKUs as i recall, i had the EU version with 25mW VTX transmitter limit. The hardware was capable of much more and the US version had ~200mW i think. There was a wand thing with an NFC writer some people could buy that could temporarily ignore the region check and put it in “race mode” which allowed any power level to be set. However those were restricted sales, the consumer version of the wand didn’t have the race director mode. Eventually i ended up with one of the race director wands too but not before i tried to hack the quad. Anyway, i dumped the firmware. Figured out what the CPU was. Disassembled the firmware blob. I traced where the region check was performed then overwrote the instructions with noop’s. Assembled, flashed and then promptly flew it into a tree at 50mph. It survived just fine. I still have it to this day, just with upgraded motors.