Yealink T58 firmware showing unsupported on 3cx v20 1494

[robbiederby]

I have recently purchased a Yealink T58 from eBay which has firmware 58.86.0.160 running on it.

The phone works perfectly, provisioned no problem, however, the 3CX dashboard is claiming that it's "unsupported firmware" and is telling me to upgrade it. When I attempt to upgrade it removes all customisation, BLF stops working and I can no longer make calls until I delete the handset and re-provision it fresh.

Is there any way to remove the unsupported firmware notification? Or add the firmware version to the supported list?

Thanks
Rob

 

[SteveITS]

.39 is the latest supported per https://www.3cx.com/docs/phone-firmwares/. You can ignore it, and see if any problems actually happen, or try to manually install the earlier version. if you ever contact 3CX support about an issue with this phone they’ll ask you to try again with approved firmware.

 

[robbiederby]

Thanks for the reply Steve, I've attempted to downgrade the firmware to v.58.86.0.39 but unfortunately the phone throws up a "Software limit" error, which I can only assume means that once you've updated to this version, you can't go backwards.

Unless anyone knows of any other way of bypassing this and forcing the update?

Thanks
Rob

 

[Les Webb]

I think you can force the downgrade through a USB install of the firmware. I remember there being instructions out there from Yealink for earlier models. Not sure about the T58 though.