I recently "downgraded" my Phantom 3 Advanced firmware from 1.6.40 to 1.3.20. I did this by parting out and selling the updated Phantom and buying a new one, of course. I got a new P3A from dji with the old style motors, which I actually prefer. Anyways I have no issues with dji go app v2.4.3 on iphone and can fly normally, but I cant get anything to work on my Samsung Galaxy Tab E. I have tried dji go 2.4.3, 2.4.2 and they crash when trying to connect. It appears litchi is also incompatible.