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If you got the stick on eBay, you probably got a fake Sony stick. Never buy memsticks from eBay - more than 80% are fake.
As to whether you can use an 8GB stick or not - Sony added support for 8GB sticks in 2.71, so any firmware newer than that can handle 8GB, including the custom firmwares based on 3.xx. You could try formatting the stick in the USB via the System Settings -> Format Memory Stick.
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