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Cisco 8941/8945 IP Phone Stuck or Frozen with "Upgrade in progress"
The Cisco Unified IP Phone 8941 and 8945 may become stuck, hung, or frozen with "Upgrade in progress" on the display. When this happens the spinning progress icon will stop spinning and the phone will not respond to button presses.
To recover a phone that is stuck at the "Upgrade in progress" screen due to trying to upgrade to firmware version 9.4(1) from a source firmware version other than 9.3(4) the phone will need to be powered cycled. Power cycle the phone only after changing the phone load in Cisco Unified Communications Manager (CUCM) to 9.3(4) instead of 9.4(1) to fulfil the stepped upgrade requirement. After the phone has successfully upgraded to firmware version 9.3(4) the phone can be upgraded to 9.4(1).