This morning I updated to version 1.7.40 on my remotes and lost use of the slave controller. After 2 hours of going around in circles on DJI chat I'm no wiser. I was advised to downgrade the controllers to 1.6 but having done this the master displayed only the Phantoms and I have the inspire 1. I have now upgraded back to 1.7.40 in the master but can't change the slave from 1.6 The final advice from DJI was that it was probable that my devices (Samsungs) were not compatible with the Go app 2.8.3. I have been using them for 10 months. Can anyone help please?