Downgrading 2.01 firmware

A friend showed up yesterday with his PSP, apparently a used one that someone had given him because they hadn't used it in a long time. It's running 2.01 which, as far as I can tell, has a couple of vulnerabilities.

The ultimate goal is to get the thing running some kind of custom firmware (and from there set up a Pandora's battery so that we can reflash our 3.80 PSP). Last I heard, the best bet would be Dark-Alex's M33 firmware of some version.

As for downgrading, there is a 2.01 downgrader, which seems to work by faking the version number on the current firmware, allowing you to install the 1.50 upgrade. The problem is that it's really old, and I can't find any information on it - I can't even tell if the thing actually works. I also can't find any downloads of it, the required eLoader files, or just about anything else from that far back.

So, does anyone remember what to do with a 2.01 PSP, and where I can get hold of the required tools?

Can't you just update it to another firmware which has an easier to find Downgrader?

Downgraders
Official Firmwares

Maybe, but as far as I can see they all require an unpatched copy of GTA, which we don't have.

Edit: Never mind - there's quite a few there that would work, including the 2.01 downgrader. Thanks for the links!

Oh right, fair enough. There's another one which uses Lumines, if you've got that ?

Anyway, have you checked this site ?

Reading the Readme, you'll also need the 1.5 .eboot, which you can get from my post above this, and Eloader 0.98.

Edit: lol, here's me reading the Readme and finding all the files for you and you hadn't even checked to see if there were some that worked ! :P

Thanks. That appears to be just about everything I'll need.

It sounds like the 2.01 downgrader wasn't available until long after the 2.5 / 2.6 / 2.7 downgraders, so that might explain why I can find so little mention of it. From the sound of it, it's not likely to brick the PSP, so that sounds like the best bet.

Yeh, you should be fine !

yea 2.01 downgrader was released ages after 2.5x + downgraders, i hear is stable so thats a good thing ;)

I didn't think of it when I saw the question, but it's by Noobz, a very trustworthy group.

I used the MPH 2.0 downgrader (which this is based on) when it first came out, follow the instructions in the readme and you'll have no problems. I guess giving the memory stick a format before copying the files over is always a good thing but not necessary.