Off Topic - Polycom Soundpoint 335 IP Phone

I have a Polyphone Soundpoint 335 IP phone, for which the admin password has been lost. I have tried to reset the phone using the “back door” with the serisl number/MAC address procedure, with no luck. The phones web page also appears to have been disabled. Is anyone aware of any other approach that might let us get into this phone?

Thanks for your time.