Post v16 firmware updates Yealink

[DrLloyd]

Out of 15 instances that I have updated, I have 5 that are unable to update phones after v15.5- v16 update. They are all currently on 16.0.3.676 and the phones are Yealink T series running various 66.83.0.20,55 firmware trying to update to 66.84.0.95. You check the phone, and click +Firmware- it acts like it is going, then... nothing.

I have seen several posts on this citing various issues- like too old of a firmware jump (They were up to date before the v16 update!) or something about the web server not responding to the update on port 80 (fine I killed the firewall to test and no effect) Also saw one that says delete the instance and start again.
I saw one fix by downloading the firmware from Yealink, but I want to keep everything stock 3CX.
Any thoughts?

 

[AWS2P]

did you already tried a factory reset on phones and retry a FWU after?

 

[DrLloyd]

Factory reset no good. Only tried one phone, I have about 300 total so anything manual is basically a no-go.

 

[AWS2P]

ok , understood, bad idea

 

[AWS2P]

perhaps open a support ticket on yealink side hoping for industrial solution for so numerous phones to update

 

[JohnS_3CX]

Please look at our yealink guides for the specific models you are having trouble with.

If you reset one phone, and manually upgrade its firmware before any provisioning takes place, and the phone refuses to update, then you are likely installing a version that is too new without installing the previous versions. Our guides have been updated to help you with that, otherwise contact Yealink directly. https://www.3cx.com/sip-phones/