It may be that pspupdates has a personal vendetta against me, but I can't make their site move any faster than dead dung, and as many of you might have guessed, dead dung dun go nowhere fast. If you have the time and feel up for the effort, could you please consider helping me downgrade my 2.00 to 1.5? From there on, I should be able to use the stuff in this topic, but searching through their archives at poo-speed will make me able to downgrade come next spring when the artifical decomposing is finished.

i actually have an idea already, but since it warns of 2.01 and shit, I'm not too sure about trying it.
http://www.hackaday.com/2005/09/28/how-to-psp-2-00-to-1-50-downgrade/ and
http://pspupdates.qj.net/Working-PSP-Firmware-2-0-to-1-50-Downgrader-/pg/49/aid/8213 however! for the sake of science, I will (as soon as I find another 1.5 firmware). If you want to point out how wrong I am in doing so, please do!
edit: Phew, solved it. What you need is another .15 firmware, and it's quite tricky to find. If you can't, PM me, I'm gonna keep it.