Poly / Polycom VVX factory reset

Got a Polycom VVX series phone that no-one remembers the password to? In theory, the following instructions will do a factory reset, and then the default password of 456 should work again.

https://knowledgebase-iframe.polycom.com/kb/viewContent.do;jsessionid=0C3EFDD990C4D10BB55A50077A086D38?externalId=32151

Just in case that link, and the video goes away:

The procedure:

This procedure works for all VVX phones up to the VVX 601 series. It describes and demonstrates the following steps:

* The phone will either prompt “Configuration Reset” or “Invalid Password”.