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I have decided that the motherboard is fried in some way. The firmware in the dump looks correct (I.E. all files that are supposed to be encrypted have the SCE header magic, metldr has a correct header string and size, and all vsh files are present.) I will try to save this board if/when better firmware diagnostic tools come available but in the meantime I have found a replacement COK-001 CECHA motherboard and blu-ray daughter combo on ebay. I have verified that the seller has pulled it from a working system. Not too bad for $30. I will be extremely careful and pull full hardware dumps every step of the way this tiime while doing the downgrade (if needed) and debug conversion.
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