Microsoft has confirmed an issue with Polycom VVX handsets connected to Office 365 Skype for Business online.
The handsets are continuously attempting to download a firmware update that was published in Office 365 over the weekend. The update then fails to install, forcing the handset into a continuous reboot loop.
One thing to note is that currently, setting Set-CsIPPhonePolicy -EnableDeviceUpdate to $false has no effect and does not prevent the update from being pushed down to the handset.
Microsoft is working to resolve this issue.
I ran Set-CsIPPhonePolicy -EnableDeviceUpdate $false and you’re right, it didn’t have an effect on most of the phones I had in production. However, every new VVX-501 that I have deployed since has not had the problem. I have a ticket open with Microsoft and am eagerly awaiting a resolution like everyone else.
Strangely the VVX-311 is not doing the same. Just the 501 & 601s are stuck in this loop.
Just FYI that I was able to fix this issue on my phones by standing up a temporary FTP server and pointing the phones to it so that it could update itself. I think the “update loop” basically caused the existing copies of the firmware to get destroyed on the phones, so had to do a factory reset and push the latest version manually and all’s back to normal now.