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What is the best way to update a PSP via USB? - Quora
How to install custom firmware on PSP (model-E1004, firmware-6.60)[HD] - YouTube
Refurbished Sony PSP E1004 Seris Portable Console Black PSP-E1004 - Adapter not included - Walmart.com
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How To Update Your PSP TO 6.61 Official Firmware in 2021 - YouTube
Playstation Portable (PSP) Model Specifications
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updating cfw from 5.50 prome 4 to 6.61 on jap version psp 1004 : r/PSP
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4 Ways to Upgrade Your PSP Firmware - wikiHow
Repairing a PSP Street (E1004) & Installing Custom Firmware in 2021 - Power/Charging Fuse + Speaker - YouTube