Just got the same model PSP i had way back for 40$, just needs a battery. Have some questions : r/PSP
Hack, Install Custom Firmware on Sony PSP-E1004 Street
4 Ways to Upgrade Your PSP Firmware - wikiHow
Updating The System Software - Sony PSP-E1008 Instruction Manual [Page 24] | ManualsLib
Find Out Which Firmware Version a PSP Runs
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Digiex
4 Ways to Upgrade Your PSP Firmware - wikiHow
Just bought a PSP 1004! this thing is in almost excellent shape, everything is working. its on firmware 2.81! i am gonna put CFW on it. I owned a Street model(E1004) before
4 Ways to Upgrade Your PSP Firmware - wikiHow
PSP update: 6.61, firmware, PlayStation
How to Download and Install GAMES on PSP E-1004 - PlayStation Portable - YouTube
4 Ways to Upgrade Your PSP Firmware - wikiHow
PlayStation Portable - Wikipedia
Sony Updates Its PSP Console with Firmware 6.61 – Download Links Available