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Yealink phone locked with microsoft


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I have  yealink T42S phones,
They wont provision correctly,
on the screen It says sign in,
user sign in or web sign in
 
When select user sign in it asks for username password and website url
When i select web sign in, its give me a URL which pairs with the computer, whatever.
 
Sounds like it's configured with Microsoft or something like that.
Resetting to factory doesnt help.
 
When i try pairing it gives me this url: 
http://aka.ms/sphone
with a code, 
 
 
Does anyone know how to reset it to factory ?
 
 
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Yes, you can use the TFTP Recovery method to put a stock firmware back on the phones. (Just Google "Yealink TFTP recovery".) 

You can actually do the process without using a TFTP server if you wish, by putting the files on a USB thumb drive. Either way, you hold down the speakerphone button while the phone boots up and you'll be presented with a simple menu where you can load the recovery files.

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