Picked up a PSP-1000 on firmware 1.0. Any reason to NOT be on 6.61? : r/PSP
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
4 Ways to Upgrade Your PSP Firmware - wikiHow
PSP 3.50 firmware available: "Remote Play" over the Internet | Engadget
Wireless PSP Custom Firmware installation is now possible! - Wololo.net
4 Ways to Upgrade Your PSP Firmware - wikiHow
4 Ways to Upgrade Your PSP Firmware - wikiHow
Hack, Install Custom Firmware on Sony PSP-E1004 Street
PSP Custom Firmware Guide For All Models 2023 - pspunk