Solved Yealink T21P_E2 firmware warning at V16

[CharlesChan]

After upgraded the system to v16 from v15.5, all the Yealink T21P_E2 became "red" at the Phone page. I have tried to upgrade(or downgrade) the firmware from 3cx page as well as the phone Web configuration page, and both FAIL. Can anyone help? Thanks in advance.

 

[Alphabetic]

Can you fill this out?

• 3CX Version, e.g. Standard Annual 16.0.2.910
• Server OS, e.g. Debian 9 / Windows Server 2012 R2 / Raspberry Pi
• Is the 3CX Server Hosted and where?
• IP Phone Make/Model/Firmware
• Provisioning Method: Local / VPN / STUN / SBC
• Trunk Provider or Gateway Make/Model
• Has the Firewall Checker passed: YES / NO
• Are custom Phone Templates being used: YES / NO

Have you tried rebooting a phone and pushing out the FW upgrade?

I sometimes struggle when pushing FW to Yealinks via STUN and I typically have to reboot them first.

 

[CharlesChan]

• 3CX Version -- Standard Annual 16.0.676
• Server OS -- Debian 9
• Is the 3CX Server Hosted and where? Selfhosted
• IP Phone Make/Model/Firmware Yealink T21P_E2, current FW: 52.83.0.55
• Provisioning Method: STUN or local
• Trunk Provider or Gateway: General Trunk
• Has the Firewall Checker passed: YES
• Are custom Phone Templates being used: No

I have tried to reboot the phones many times and the firmware still the same.

 

[Alphabetic]

Provisioning Method: STUN or local

 

[CharlesChan]

Some are STUN, some are local, but all can't be upgraded

 

[CharlesChan]

I also tried to upgrade from the phone web interface but still got upgrade fail message.

 

[JohnS_3CX]

Start with a local phone, factory reset it and try to upgrade firmware manually from the web interface of the phone. If that fails, then the issue is not related to 3CX but probably to the phones themselves. Lets see how this test goes first and continue accrodingly

 

[CharlesChan]

Yes, I have tried disabled the dhcp66, factory reset the phone, and still fail to upgrade the firmware by the web interface.
The phone's firmware (52.83.0.55) is provisioning by the v15.5 which can't be found from the Yealink website. I think this firmware is a special version for 3CX from Yealink, I doubt that this firmware has some issue on the firmwware upgrade feature. I have about 20 set of T21p E2 phones so it can't due to the HW issue.
Howerver, the phone acutally working properly although being highlighted in red.

 

[JohnS_3CX]

Ok try to get 52.84.0.10 and 52.84.0.15 from Yealink's site and upgrade manually. if this also fails I'm wondering if you have phones with locked firmware (ie. Lydis or some other regional localization)

Once you are on the 52.84.x.x family of firmware though, reconfigure your phone and try to upgrade it from the management console and it should succeed. Some times if the firmware is too old you will need. to get the inbetween versions installed first

 

[CharlesChan]

I tried that too. All the newer or older version I can download from Yealink website are not work.

Ok try to get 52.84.0.10 and 52.84.0.15 from Yealink's site and upgrade manually. if this also fails I'm wondering if you have phones with locked firmware (ie. Lydis or some other regional localization)

Once you are on the 52.84.x.x family of firmware though, reconfigure your phone and try to upgrade it from the management console and it should succeed. Some times if the firmware is too old you will need. to get the inbetween versions installed first

 

[JohnS_3CX]

Contact Yealink directly please. They should be able to assist in this case.

 

[CharlesChan]

Eventually, I success upgrade the FW(52.84.0.35) downloaded from Yealink website's 3cx page.

After that, I can provision the latest FW(52.84.0.95) from the 3cx's web console.

Thanks for the supporting.

 

[AWS2P]

I use the same phones with no problems in that FW

 

[JohnS_3CX]

Glad to hear it was resolved, thanks for updating the thread with your solution