So guys - I think I found another workaround. Fortunately that one will not use the reset nor the safe-mode.
- Put your phone in airplane mode.
- Do regular reboot
- Enter settings menu of WiFi (be carefull not to turn WiFi on! so I recommend the longer way through the complete settings menu)
- You will see the WiFi frequency chooser on “Automatic” → toggle it to 5GHz*
- Now switch WiFi on / airplane mode off
*with me neither 2.4Ghz nor reselecting “Automatic” worked - I fear here is the problem of some kind of config inconsistency which will screw up the widget. So forcing a new setting aside from the default “Automatic” might do the trick for you. So if you had the “5GHz Option” before it went dark, I guess the “2.4GHz Option” will work.
That’s it! Still though, I think a “Solution” requires Fairphone to actually get rid of this problem…
As background info: I tested it once, and before I did it, I rebooted to safe-mode. Still I didn’t change anything - just confirmed that the option reappeared within the WiFi settings menu. The beauty of this rather unorthodox steps (instead of a well thought WiFi settings reset within safe-mode) is: your contacts will stay intact, your home screen will stay intact, your wifi list will stay intact. Beaware, if you reboot to safe-mode even once, that will or might not hold.
Thanks a lot - wouldn’t have gotten here without you!
(This bug happened to me just lately after the upgrade from FP OS A.0077 → A.0084)