Upgrade firmware when not using on-premise

Occasional Visitor

Upgrade firmware when not using on-premise



I have an older CX600 IP phone that has firmware that cannot connect to SfB and I do not have an on-premise Lync server.  Is there a way to update the firmware on this phone without the on-premise server?


It has v4.0.7457.0


The USB connection fails, signing in on the phone fails.


Thanks for any help

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Polycom Employee & Community Manager

Re: Upgrade firmware when not using on-premise

Hello eugp,

Polycom and other manufacturers produce these optimized for Microsoft® Lync® or Skype® for Business devices after a reference design and the embedded OS running on the phones is provided, supported and maintained by our partner Microsoft®.

You therefore may want to reach out to the Microsoft® community and / or Microsoft® support directly instead as this is the most direct and efficient path.

Polycom is unable to add any new features into the functionality of these CX Devices

Please try here

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.


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. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
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