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CMS-XML Recovering from a failed firmware update procedure with the EOS 1Dx or EOS 5D MkIII and EF 40mm f2.8 STM
To restart the firmware update please follow the below procedure. 1. Remove the battery from the camera and remove the lens from the body, do not remove firmware update card . 2. Reinsert the battery and in the camera's menu go to "SET UP3" and select "Battery info."