Lost both the selfie camera and air triggers after system update. Very annoying problem 😕
After many failed attempts to fix issues finally found a fix for both. The air triggers needed a factory reset and reconfiguring armoury crate. The selfie camera requires to delete cache and memory followed by a reboot with power button and up volume pressed. Proceed to fast boot. Issue resolved. Either on there own or after each other did not fix the issue.
Hope this is helpful and works for you.
