downgrade to 1.5
then upgrade to 3.04OE
Im on 3.2OE-C so i dont know about 3.40
2.60 downgrader: http://www.psp-hacks.com/file/605
Edit: here is the 3.40OE firmware but i dont know if u have to upg to 3.2OE first http://www.psp-hacks.com/file/1132
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