How do I know what Sony PSP firmware version I have? - Ask Dave Taylor
4 Ways to Upgrade Your PSP Firmware - wikiHow
4 Ways to Upgrade Your PSP Firmware - wikiHow
PSP Firmware Update. Stream Content Over the Internet | WIRED
OFW psp & CFW psp blogs - Firmware 6.39 ME-5 was develop and release by PSP Developer Neur0n who has decided to release his latest PSP Custom Firmware 6.39 ME-5 for users
How To Update Your PSP TO 6.61 Official Firmware in 2021 - YouTube
Wireless PSP Custom Firmware installation is now possible! - Wololo.net