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The Intel(R) Server Platform Services [SPS] 4.0 Firmware for Greenlow, Purley, Bakerville and Harrisonville Intel(R) Management Engine [ME] -BIOS - Interface Specification document # 548530 has the information that may help you. It is is accessible when you are logged into your Resource & Design Center (RDC) privileged account at the following website:
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I was able to download the mentioned document.
Still I have not been able to find any information or pointer to where I can download the software -Server Platform Services [SPS] 4.0 Firmware for Greenlow, from.