Polycom Soundpoint 331/335 Upgrade

How to reset and update the Polycom Soundpoint 331 and 335 phone
Default pass: 456 or vonage account number
To reset pass: on boot hold down 1,3,5,7 and enter the MAC address
(use lowercase for any alpha characters)
Caution if you Reset to Factory you will need to reprovision the phone

Update the provisioning server either on boot or through Menu
Settings->Advanced->Admin Settings->Network Config
->Provisioning Server (on older phones this is Server Menu)
Set the provisioning server to: 140.242.64.35/411
Set server type to HTTP
You will need to use # to switch to various characters
Reboot the phone
The phone will show it’s upgrading and will reboot several times

After the upgrade you should be able to get into the web interface
https://[phoneip]
admin/456 or vonage account number
Set local DNS
Set local NTP

As of Dec, 2017 the following versions on 331/335
UC Software Version 4.1.1.0731
BootROM Software Version 5.1.1.0132

Reference:
Polycom Setup
Vonage Setup