I also have problems updating the Fly Safe data base on my GS7 Edge. I have to use a Slate 8 tablet. I usually check for updates before I leave the house to take advantage of my wireless. I will try the Slate and try that change when I change modes and get that message again, and post my findings.
Activating this Drone was a trial and error solution using both my phone and tablet in various configurations also... tried so many I can't remember how I did it.
For firmware updates I use DJI assist on my laptop.