Dell Chassis Management Controller Version 6.0 for PowerEdge M1000e User’s Guide

For M1000e CMC version 5.0 and later, the firmware includes a signature. The CMC firmware performs a signature verification step to ensure the authenticity of the uploaded firmware. The firmware update process is successful only if the firmware image is authenticated by CMC to be a valid image from the service provider and has not been altered. The firmware update process is stopped if CMC cannot verify the signature of the uploaded firmware image. A warning event is then logged and an appropriate error message is displayed.

Signature verification can be performed on firmware versions 3.1 and later. For firmware downgrade to M1000e CMC versions earlier than 3.1, first update the firmware to a M1000e CMC version that is greater than or equal to 3.1 but less than 5.0. After this update, firmware downgrade to earlier, unsigned M1000e CMC versions can be performed. CMC versions 5.0 and above carry the signature as part of the released image and also carry the signature files of CMC versions 3.10, 3.20, 3.21, 4.0, 4.10, 4.11, 4.30, 4.31, 4.45, and 4.5 only. Therefore, CMC firmware update is supported only for these firmware versions. For any version other than these, first update to any of these versions, and then update to the required version.