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System Update - PlayStation
Updating The PSP System Software to 6.60 / 6.61 - pspunk
4 Ways to Upgrade Your PSP Firmware - wikiHow
How To Update Your PSP TO 6.61 Official Firmware - YouTube
PSP FAQ - How Do I Update My PSP Firmware? - Lifewire
Official Firmware (OFW) - PSP Developer wiki
PlayStation Portable system software - Wikipedia
How to Update Your PSP to Official 6.61 Firmware (The last ... - YouTube
How to Update Your PSP Firmware - Online Tech Tips
Version selection - PlayStation
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