Like numerous DJI pilots I went ahead and upgraded my Controller's Firmware as suggested by a message on my controller. We all know the mess it causes when you upgrade the Controller firmware before updating the aircraft's firmware. The controller now constantly beeps, the beeping stops when I calibrate, however once the controller is turned off it and restarted the beeping resumes until I calibrate again. Therefore I now always have to calibrate to stop the beep before I can fly. I tried to roll-back the controller's firmware, that was an exercise in futility. Whenever I insert the USB stick with the roll-back firmware into the controller, it continues beeping and nothing happens. My aircraft has now become erratic. HELP!!!!