I just bought a GDU02. But not happy. When I downloaded the APP GDU mini..., It said I first need to register..OK, It said enter hone or email. I tried both, then it asked for a Chinese phone number to get the CODE to finish registration . ???? I am in the US. So then I tried to call the Tech Support in TX. It said the number does NOT except incoming calls??? I am about ready to send it back. I thought DJI had the worst CS, but these guys have them beat. If ANYONE knows what, if anything, I am doing wrong, please let me know.