I returned the controller I purchased on EBay..Autel phone support guy said it was a bad controller. I bought a refurbished controller directly from Autel and today it paired!! Hope you get back in the air soon!
Any update? I'm going through the same thing..but my V1 is 2+ years old..had to swap out the controller and now won't connect. Very frustrating..especially when I've paired many with the Phantom 4 with ZERO issues.