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Dell PowerEdge RAID Controller 12 User’s Guide PERC H965i Adapter, PERC H965i Front, PERC H965i MX, and PERC H965e Adapter

Firmware downgrade operation may fail if the firmware version downgraded to does not have the supported feature set

Error Message:
A validation error occurred during the firmware update indicating the FEATURE COMPATIBILITY CHECK failure event. For example, inability to downgrade the firmware version of PERC12 H965i or H965e controller because the read-ahead feature is enabled on the VD.
Corrective Action:
Expected behavior if the firmware behavior is 8.8.0.0.18-26 and later versions. If enabled, disable the read-ahead feature on the VD before downgrading the firmware version.
NOTE:Dell recommends that you must always use the latest firmware version of the controller available on the support site.

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