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There are a few different ways to update your PSP's firmware. We breakdown all the ways to update your firmware here to save you time.
Updating The PSP System Software to 6.60 / 6.61 - pspunk
4 Ways to Upgrade Your PSP Firmware - wikiHow
Dummy's Guide to Installing Custom firmware on a PSP
How to Update Your PSP to Official 6.61 Firmware (The last Official Update)
How to Update Your PSP Firmware
PSP Hacking Guide : 5 Steps - Instructables
PSP Custom Firmware Guide For All Models 2023 - pspunk
PSP FAQ - How Do I Update My PSP Firmware?
Install or use custom firmware on any 6.39 PSP [PSP, PSP Slim, PSP 3000, PSP Go]
How do I know what Sony PSP firmware version I have? - Ask Dave Taylor
PSP Firmware Update. Stream Content Over the Internet