Recovery Mode on Yealink IP phones 
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4.  After a handset is registered, press          (for W52P/W56P base) or        (for W60B base) on the 
handset to verify the current firmware version. 
For W80DM/W80B 
For the W80DM/W80B, there is no screen to show information for you. The W80DM/W80B uses 
192.168.0.23 as its default IP address, so you need to configure a static IP address for your local PC 
where you have the TFTP server installed. 
Procedures: 
1.  Configure the static IP address on your local PC. 
It must be configured as below: 
 
2.  Click OK twice to save the settings. 
3.  Long press          and reconnect the power adapter to trigger the recovery mode. 
The W80DM/W80B will download and upgrade the firmware from the TFTP server.