Avaya 3730 factory reset?

Question

Avaya

There are three tubes (1,2,3) Avaya 3730 connected to the PBX BP 250.
There was a need to swap them (1-2, 2-3, 3-1), 1 and 2 unsubscribed from the PBX and 1 registered for 3, which has not yet been unsubscribed, after which 1 went into eternal reboot, and 3 stopped calling. I tried to unsubscribe 3 and re-register it on the PBX, same story. And finally, I also tried to register 2, but to a different number, I also went into eternal reboot. Now the question is: How to return them to service?