Does a Lync phone reset to factory default “really” reset the phone?

Had problem with som Lync Phones (Polycom CX600). That suddenly stop signing in. Did a reset to factory deafult and the issues remained. Solution was to login with extension and pin and then connect the phone to PC using USB and login. Now I was able to login the phone using Lync client. This procedure was repeated on several phones. It seems to me that a factory default does not completely remove all old settings.  

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