My 3CX Phone System is up to day with all current service packs. I'm trying to update our Yealink Phones Firmware. But now I'm getting a error message. I was wondering if you guys even seen this error and know what it means. ERROR - AN EXECPTION OCCURRED FIRMWAREFORM ERROR: THE GIVEN KEY WAS NOT PRESENT IN THE DICTIONARY. Anyone know what key the system is talking about. Any help would be great. THANKS.