I got so tired of all the changes, many with newly generated problems, especially when I tried to photograph a friend's Rocky Mountain Home up at 9,000' when my P4 wouldn't start unless I signed in where there is absolutely no celular service! Luckily I brought my Inspire 1V2 using old out of date Go App but which functioned without problems! I have not used my P4 since then but today using apkmirror I reloaded my Android Invidia Shield K1 with the DJI Go4 App, Version 4.1.3 Even though most everything functioned correctly I wound up with a "Gimbal Vibration Error" announcement so I just downgraded to DJI Go4 App Version 4.0.0 on my LG V20 Smartphone. This Version is from back in January 2017 which I used to use. This Version in the PhantomPilots Forum has been reported as trouble free. I haven't flown it yet but it appears to agree with my P4 Firmware! And yes, I had to sign the what appeared to be a 400+ page DJI Agreement to start trying different DJI Go4 Versions which is ridiculous!