OEM Firmware change

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Threaded Mode \| Linear Mode OEM Firmware change
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complex1 Offline

3CX Adv. Cert. Engineer

Posts: 1,438

Joined: Jan 2014

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Post: #2

RE: OEM Firmware change

(04-14-2021 06:10 PM)NotKnown Wrote: Hello, I have an T48S with an firmware of Vodafone (Netherlands). (66.84.133.3)
But that firmware doesnt work with Broadsoft of Routit/KPN.

When i try to flash the normal firmware of Lydis (dutch supplier) or Yealinks, it ends in an error:
Firmware update failed!
OEM version different
Rebooting, please wait...

When trying this in RecoveryMode, via USB it doesnt work, also via TFTP end in error -1 or file to big

Does anyone have idea to fix this?

Hi,

I think your carrier has locked the phone.
You have to ask them to unlock the phone, maybe then you can change the firmware.

Only use recovery mode if the phone is bricked.

Hope this will help.

Kind regards,
Frank.

I am not an employee of Yealink.
Dutch is my native language, not English. Apologies for my imperfect grammar.
Please do not send unsolicited PM messages. I will not answer them.

04-14-2021 07:41 PM

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OEM Firmware change - NotKnown - 04-14-2021, 06:10 PM

RE: OEM Firmware change - complex1 - 04-14-2021 07:41 PM

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