Wont connect to app. Status light controller flashing green?

Hi everyone

Could someone please help me ? I have spent hours and days on the internet trying to solve my problem with my dji phantom 3 advanced.

1. Green status light on controller flashing instead of solid ?

Cannot find anything about this or anyone having the same problem.

2. DJI Go app on Galaxy S8 wont recognise or connect to my phantom 3 advanced ?

Read numerous posts about this problem and none of the recommendations work. Tried numerous different cables to connect also tried my wifes Galaxy S7 and daughter's iPhone 8 but still no joy.

Controller connects to drone ok and I can fly in line of sight but seems to be stuck in beginner mode. Restricted distance.

Everything worked fine when I last used it about 6 months ago. I can update firmware on drone but without being able to get dji go app working I cannot update my controller .

In the DJI Go app it wont let me get past "How To Connect"

Please can anyone HELP