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PSP FAQ - How Do I Update My PSP Firmware?
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Memory stick not recognized. : r/PSP
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Wireless PSP Custom Firmware installation is now possible! - Wololo.net
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When I try to update my PSP it says it can't detect my memory stick. Does anyone know how to fix this? : r/PSP
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Amazon.com: PSP Memory Stick Adapter, Funturbo Micro SD to Memory Stick PRO Duo MagicGate Card for Sony Playstation Portable, Camera, Handycam : Electronics