Yealink SIP- T28P - How to upgrade firmware?

User Guide for the SIP-T28P IP Phone
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2. In the Export or Import Configuration block, click Export to open file download
window, and then save the file to your local system.
To import the phone configurations via web user interface:
1. Click on Settings->Configuration.
2. In the Export or Import Configuration block, click Browse to locate a configuration
file from your local system.
3. Click Import to import the configuration file.
Note
How to upgrade firmware?
To upgrade firmware via web user interface:
1. Click on Settings->Upgrade.
2. Click Browse to locate the required firmware from your local system.
3. Click Upgrade to upgrade the firmware.
The file format of configuration file must be *.bin.