SimpliSafe Video Doorbell Pro will not reset or needs to be reset safely

The checks in more detail

Check that the doorbell receives steady power from the transformer, since a weak transformer causes reboots, and that the Wi-Fi reaches the front door. Restart the doorbell by powering it off at the breaker briefly, then restore power. If you do need a reset, such as when moving house, replacing the router or selling the doorbell, prepare. Remove it from your account in the SimpliSafe app so that it is not still registered to you, and note any settings you want to recreate, such as motion zones and notification choices.

Perform the reset with the button or sequence that SimpliSafe describes for the Video Doorbell Pro in its article; the sequence is specific to this model, so follow the official steps and wait for the light pattern that confirms the reset. Keep the doorbell mounted and powered during the process, and do not disconnect the wires while the doorbell is on. After the reset, set the doorbell up again as a new device in the app, joining your Wi-Fi, ideally on 2.4 GHz if that is what it supports, and check that the chime, indoor or digital, is configured.

A mechanical chime needs the chime connector fitted correctly in the wiring, and a digital chime needs a setting in the app. Test the ring. Review the motion settings and the video quality. If the doorbell will not reset, will not join Wi-Fi after setup or keeps rebooting, check the power and the wiring and contact SimpliSafe with the serial number, found on the back. If you are not comfortable working with the wiring, use a qualified electrician.