• ×
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
  • ×
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
Guidelines
The Poly Phones Knowledge Base is live! We look forward to helping you with common issues and troubleshooting advice!
Locked

‎03-06-2025 01:12 PM

HP Recommended
Product: CCX 505

We are testing upgrading our Poly CCX Series phones to Android AOSP from Android Device Administrator. However, for testing we would like to revert to an older OS (anything pre 9.1.X) so we can test several things/scenarios. When I go to downgrade my Poly Phone in Poly Lens it fails to apply an older OS as well as if I try from the phone's web page. Is this expected? I tried both 9.0.X and the 8.1 Downgrade OS that was made available some time back. 

Tags (1)
1 REPLY 1

‎03-06-2025 01:35 PM

HP Recommended

Hello @JacobJ93 ,

 

Welcome to the HP Poly community.

 

From this: [Software] PVOS 9.1.0 for CCX and Trio C60

 

 

!!!!  Important note !!!!

 

  • Downgrade limitations

    • Due to the introduction of new Teams applications for the move to AOSP device management and changes to the phone’s Android OS, after you upgrade your Poly CCX or Poly Trio C60 phone to PVOS 9.1.0, PVOS 9.1.0 becomes the new minimum software version.

      Returning to earlier software versions is not available, and the phone rejects attempts to install earlier versions.

The same for Poly Lens:

 

This release has specific downgrade limitations. Review the section on downgrade limitations before you install this release for important software update considerations.

 

Best Regards

 

Steffen Baier

------------------------------------------------
Notice: I am an HP Poly employee but all replies within the community are done as a volunteer outside of my day role. This community forum is not an official HP Poly support resource, thus responses from HP Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge.
If you need immediate and/or official assistance for former Poly\Plantronics\Polycom please open a service ticket through your support channels
For HP products please check HP Support.

Please also ensure you always check the General VoIP , Video Endpoint , UC Platform (Microsoft) , PSTN
Was this reply helpful? Yes No
† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the Terms of Use and Rules of Participation.
Didn't find what you were looking for? Ask the community
† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the <a href="https://www8.hp.com/us/en/terms-of-use.html" class="udrlinesmall">Terms of Use</a> and <a href="/t5/custom/page/page-id/hp.rulespage" class="udrlinesmall"> Rules of Participation</a>.