Question
The 3ware 9550SX-12/16ML controller on the H8DA8 motherboard rev 2.01 BIOS 1.1b (latest as I could find) posts the following error if I try to access its BIOS:

“Insufficient PMM RAM to load controller software. Your system motherboard may require a BIOS upgrade.”

How can I solve this?
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Answer
Please update the BIOS to the latest version and flash 3ware 9550SX(U) Series controller on the H8DA8 motherboard to 3.08.00.016 3ware firmware.

Here is the download link with working versions of CLI, management, drivers and firmware. It works with the latest drivers.
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