Hello fixthispolycom,
it could even be the APP_FILE_PATH="sip.ld" section within the <mac>.cfg but only you can check this.
I can lookup the reseller we provided the phone to in order for you to get support from them if the unit is up to a year or less old.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services