Yealink - Factory Reset
Factory reset restores your device to the default settings that were applied when it was manufactured.
To factory reset your device
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Press and hold the "OK" button until the screen shows (Step 2) below; if the handset does not have an OK button, press the button in the centre of the arrows.
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Confirm by pressing OK.
After you reset the device, the phone should download the configuration from our servers. If the download doesn't happen, it means your server is not set up to our minimum network requirements. Attempt to manually provision the device.
Password
If you are asked for a password, this means your administrator has set a password requirement for the factory reset option. If you are an administrator and wish to enable or disable a password requirement for factory reset, see Deny factory reset by password
User level access
"User" is the access level for the end user. Generally, only a few configurations are allowed to be written and read for access level of "user". The authentication identity for this access level is user. And the default password is user.