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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.
PlayStation Portable homebrew - Wikipedia
PSP: Custom Firmwares for Firmware 6.61 possible - Currently being updated!
trying to identify my psp model - The Independent Video Game Community
The Guide To The PSP UPDATED, PDF, Usb Flash Drive
4 Ways to Upgrade Your PSP Firmware - wikiHow
Got my PSP GO Today :) it has custom firmware 6.61 : r/PSP
Mod a PSP, Super Easy
How To Update Official PSP Firmware In 2022 Without WIFI Access
PSP update: 6.61, firmware, PlayStation
QUESTION] Just found my old PSP! Before updating or anything, is there anything cool I can try doing 1st? : r/PSP
How do I know what Sony PSP firmware version I have? - Ask Dave Taylor