VVX 300 Skype for Business Online firmware automatic downgrading

IT Services
Occasional Visitor

Re: VVX 300 Skype for Business Online firmware automatic downgrading

sorry my mistake, the web form doesnt error when adding PDU files it simply strips them out when you click post.

Polycom Employee & Community Manager

Re: VVX 300 Skype for Business Online firmware automatic downgrading

Hello @IT Services ,


Your configuration contains:




The above will always only load 5.8.0


I suggest the following:


  • Factory reset the device
  • Enable the Web Interface as shown => here <=


  • Upgrade using the Utilities > Software Upgrade and upgrade to a current version like 5.9.2 Rev AB
  • Import the attached configuration.cfg after unzipping and removing the .txt ending
  • Add your Skype for Business credentials

Do not simply import a PBU file as this contains a lot of features not required and doubling up the configuration


If this still fails please work with the support partner we already outlined.

As the unit is no longer within the warranty please be prepared to Pay Per Incident / PPI. This is all outlined in detail here

Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.

Best Regards

Steffen Baier


If official support is required please check how to phone or open a case here

The title Poly Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. All posts and words are my own & do not represent the views of Employer.


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Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge.
Please also ensure you always check the VoIP , Video Endpoint , Microsoft Voice , PSTN or other FAQ's in the different sections
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