I'm using the latest version 7.0.1. I was able to mitigate the issue by manually installing the GoPro firmware update using the SD card.
The Wifi now works but is not very stable; I lose the connection sometimes when downloading videos.
I have same issue with my hero 3, following the istruction i connect the camera to phone and go back to app but still remain in searching.
I tried on Android phone the connection go fine and work all perfectly.
I try all suggestion i found but still not solve the problem.
I have a brand new iPhone 11 with iOS 14 and last version of app 7.0.1 (4095) so i think the problem it's about the last iOS release.