I'm not on site so can't check 100%, but there's a high probability resetting to factory default will lose the connection altogether.
The password can be reset if you access the router by a cable. However the procedure opens the entire router config and you must be careful not to alter any other setting.
I'd be pleased to do it for you, but won't be on site till christmas eve.
If you can access the router with a cable I can talk you through the procedure.
Of course someone currently on site who knows how to do it may respond, which would obviously be better.