[YMCS/YDMP Free Trial Program]Yealink would like to offer Free Trial Program of Yealink device management service for our current eligible customers. You can see the details below.

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T27G Firmware Update Failed
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complex1 Offline
3CX Adv. Cert. Engineer

Posts: 1,007
Joined: Jan 2014
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Post: #4
RE: T27G Firmware Update Failed
(11-12-2019 08:36 PM)Infonetx Wrote:  I appreciate the reply.

I went through the steps as you laid them out.
- Factory default, by holding okay and selecting yes.
- Downloaded, and attempted to install the T27G- from Yealink. Gave me a 'Firmware Update Failed! Rebooting, please wait...'
-I went ahead and factory defaulted and checked the firmware version, just in case, still the same version.
- Following the most recent factory default, I tried some of the newer, but not newest versions of firmware from Yealink as well, but all failed. Each accompanied by a factory default prior to. (I tried Yealink,, as well as the for the T27G from 3CX)


- On how many T27Gs are you talking about?
- Do all T27Gs have the same problem?
- Are you the first owner of the devices?
- Are the phones bought/delivered from a reseller or telecom provider?

I do not know if it is still possible to downgrade the firmware, but please try first.
If this will work then upgrade to the latest one.

Hope this will help.

Kind regards,

Dutch is my native language, not English. Apologies for my imperfect grammar.
Please do not send unsolicited PM messages. I will not answer them.
11-12-2019 09:19 PM
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Messages In This Thread
T27G Firmware Update Failed - Infonetx - 11-12-2019, 05:58 PM
RE: T27G Firmware Update Failed - complex1 - 11-12-2019, 06:48 PM
RE: T27G Firmware Update Failed - complex1 - 08-03-2020, 03:16 PM
RE: T27G Firmware Update Failed - Infonetx - 11-12-2019, 08:36 PM
RE: T27G Firmware Update Failed - complex1 - 11-12-2019 09:19 PM
RE: T27G Firmware Update Failed - Infonetx - 11-14-2019, 08:55 PM
RE: T27G Firmware Update Failed - Infonetx - 11-19-2019, 07:34 PM
RE: T27G Firmware Update Failed - complex1 - 11-20-2019, 03:23 PM

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