I working with 3CX for the first time, I trying to auto provision 3 Cisco 504Gs. Out of the box, they came with firmware 7.48a. If I update the firmware manually to the latest, 7.53, the phone will continuosly loop with a message in the display saying "updating firmware". I think the current template from 3CX is for version 7.52a. Anyone know how to fix this?