I have a P410 with 6.64 FW, an HP SAS 6G expander with 2.06 FW, and an HP SAS 12G expander with 4.21 FW. I was able to get the 12G upgraded from 4.21 to 4.22 using the P410. I'm having compatibility issues with the 12G and my Areca 1883 cards, so I am reverting back to the 6G card, but I want to update the FW. No matter what I do, the P410 cannot find the 6G expander card. I tried just port 8 to one of the two ports on the P410. Then both ports 8 and 9 to the two on the P410. Still nothing, no device found during discovery of the 2.10 FW upgrade in Linux. lsscsi shows the P410 card the same as it did when the 12G updated (the 6G and 12G never show up in lsscsi for me, only the P410). Any ideas on how to get this upgraded? My main purpose is to see if I get better SATA 3.0 connections on my WD 10tb drives (some do connect at 3.0 but most connect at 1.5).