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T42S factory reset without default password
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complex1 Offline
3CX Adv. Cert. Engineer

Posts: 1,530
Joined: Jan 2014
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Post: #2
RE: T42S factory reset without default password
(09-27-2020 05:41 AM)JeffWilkinson Wrote:  I recently picked up several 2nd hand Yealink T42S handsets from auction.
These have been customised and the default password is not "admin".
I need to factory reset or change the password back to "admin", so I can login and reprovision them.

The firmware currently installed shows version:

So far I have tried the normal factory reset method of holding the "Ok" button down waiting for the prompt and then selecting Yes. This prompts for a password which is not "admin" (keeps saying wrong password).
I have also tried the another method I came across when searching for a answer - which is to hold the "speaker" button down and power cycle the handset. I get to the 1.TFTP or 2.USB display on the screen. I stop pressing the speaker button and press 1 for TFTP... It then displays some IP address settings (,, and a TFTP address of . The instruction i had found suggested I press OK button and then power reset the phone and it would perform a factory reset.
Unfortunately it just boots back up with the same settings.
Can anyone help me ? I would hate to have to throw all these handsets out.

Hi Jeff,

Because the user is prohibited to factory reset the phone I suggest to use the Recovery method using an TFTP server.
The necessary recovery files can be downloaded here:

As I never had to use this procedure I can’t help you with it if you have questions or run in to issues. So use it on your own risk.

Kind regards,

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.
09-27-2020 08:49 AM
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RE: T42S factory reset without default password - complex1 - 09-27-2020 08:49 AM

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