Can not change from metric to imperial on FPV drone, sent to DJI and got it back the same. No change.
You did attempt the change when the drone was turned on? Can be confusing. I know I was at first.
I even called DJI few times. They said to send it in witch i did. When i got it back they did NOT fix it. Still can not change to imperal.
Both transmitter and drone have to on to change setting. Did you do that? If DJI received it and it worked for them then they just send them back with out explanation.