Released August 22, 2007 was a method for turning damn near any PSP battery into a homemade unbricking device. Here's the video :)
Updated June 13, 2008 with annotations.
Up until now, if you upgraded a slim PSP from the original 3.60 firmware, there was no way to get back down.
I didn't like that, so I decided to make my own installer.
It works like a charm :)
Yeah, you can customize it... if you have a Pandora and a properly-set-up memory stick. No, I'm not going to tell you EXACTLY how, because the software to do it is still a little dangerous.
Though it's not clear yet whether this is just because of the Slim having twice as much memory, the web browser can now open Flash animations and web pages that were previously too big to open on the original PSP. Here we see an original PSP and a PSP "Slim+Lite" loading up the same Flash animation. The new Slim loads and plays it just fine, while the original PSP refuses to even display it.
The m33 whiz kids have done it again; this time, they've built upon the work of the Prometheus project's Pandora unbricker to develop a custom firmware for the new PSP Slim!
The hack requires a Pandora battery/memory stick, which means you'll need access to a PSP that can run homebrew. Also, it's *only* for the PSP Slim.
Sony, you just got knocked down a peg or two!
There's no way a human being could beat this song.
Period.
It's called Minami Ikebukuro Hardcore Custom, and you can get it at http://www.mediafire .com/?aoyzilammcm .
The project is now in a usable state... anyone with a non-customized 1.50 PSP can install it, and they can get back to normal by updating to 2.00 and downgrading again.
This is just more of me tinkering with the flash on official firmware; nothing really special. I converted the "-Hex-" theme by -lilfibz- to 3.90 format and flashed it, and also flashed a gameboot.
(You do this with a Pandora battery and jas0nuk's flash-over-USB menu for Pandora. It works on any firmware, custom or official.)