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Unable to upgrade firmware
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complex1 Offline
3CX Certified Engineer

Posts: 442
Joined: Jan 2014
Reputation: 11
Post: #4
RE: Unable to upgrade firmware
(02-14-2018 03:28 PM)bluetel Wrote:  
(02-14-2018 03:22 PM)complex1 Wrote:  
(02-14-2018 01:25 PM)bluetel Wrote:  Hello

we encoured problem. It's unable to upgrade firmware. Phone reboot and it's the same firmware.

we want to install the last



A possible cause:
Your phone is locked to the VoIP provider and they decide the firmware release.

E.g. you upgrade the firmware and after the reboot, the phone check for new firmware and the provider downgrade the firmware.

Please check if the phone is locked to the provider.

Hope this will help.


tks for reply.

I do hard reset, and next upgrade ...
where i can see that you said remotly ?


You can’t see it, you have to ask your provider if they can manipulate your phone firmware.
Maybe Yealink people (not me) can help you, but they are now away to celebrate Chinees Holiday.

Best regards,

I'm Dutch, not English. Sorry for my imperfect grammar.
02-14-2018 09:18 PM
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Messages In This Thread
Unable to upgrade firmware - bluetel - 02-14-2018, 01:25 PM
RE: Unable to upgrade firmware - complex1 - 02-14-2018, 03:22 PM
RE: Unable to upgrade firmware - bluetel - 02-14-2018, 03:28 PM
RE: Unable to upgrade firmware - complex1 - 02-14-2018 09:18 PM

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