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Those cards are not genuine Sony cards, they're fakes. I bought one and returned it due to data corruption. There are lots of these fake cards on eBay at the moment. My advice, stick to SanDisk.
Oh, and ALL firmware revisions are not downgradable, but v2.5 is, depending on the board version.
Anyway . . .
BTTT
I got one off ebay and it worked fine. I also was in Hong Kong over the summer and the decent electrical stores were selling the exact same ones.