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Information on how to configure CallManager Express to upgrade your IP phone, can be found in our Cisco CallManager Express Setup for IP Phone Firmware Upgrade article.
To learn how to reset your Cisco 7920 IP phone to factory defaults, read our Cisco IP Phone 7900 Series Factory Reset Procedure & Password Recovery article.
Firmware Version: 4.0.03.02
Included in CME version: 9.0, 8.8