When Ubiquiti camera is not updated for longer time (long storage etc.), its firmware becomes incompatible (too old) with latest version of Unifi Protect. This is HOWTO do update from modern Linux OS system (you may also use OS-X):
- Connect your camera to PoE switch or injector
- Reset your camera to factory settings using HW button (check official docs of your camera for location and combination)
- Connect your Linux running computer to same network as camera is
- Check your router client list for camera IP or Unify Protect camera list