I wouldn't buy a new memory stick just for the downgrade at least not w/out checkin here to see if your memory stick is fake. Link here:[GUIDE]How to tell a fake Sony Memory Stick from a real one I bought my 1GB ScanDisk memory stick a while ago on ebay and got for like 30-60% below the selling price and mine is still goin good and works fine. I used also for to downgrade my 2.5 to 1.5 FW.

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