The am of the belief that most people in my area of New York follow the majority of the rules... It's rare that I ever hear of someone around here going over 400'...
Most of the phones I have used offered to automatically turn On USB debugging when the DJI Go app was run for the first time...
Only had one phone that didn't offer... I turned it on manually...
Looks like one of the 4 little pieces that sit on top of the battery box internally in the Ac.. Sort of a buffer between the battery box and the main board...
Not sure how one would come off though..... Odd