Well I have quite a story to tell so i'll start from the top...
A while ago I started to work out how to downgrade my 3.95 slim Final Fantasy PSP to 1.5 so that I could then upgrade it to 3.30 CFW (The Dark Alex one for ps1 emulation). I tried a minimum of 5 video tutorials on Youtube, a couple of Wiki's and several guides both on this forum and elsewhere. None of which worked. I was trying to avoid creating an account on a forum to post one thing as it seems a bit rude, but I really did exhaust every other option, and I'm stumped.
The closest I've gotten was with "Rain's Simple MMS Maker" which I found on this site. I get to the stage of booting it with the 1.50 firmware on it (applied with Rains MMS Maker) with the pandora's battery in my PSP. I have booted it both holding and not holding L and it just stays black and doesnt bring up an install prompt.
It would be ridiculously appreciated if some one could point out in an idiot-friendly manner what I'm doing wrong, or if you can't pick it just lay out a simple, but detailed idiot-friendly guide from the very beginning of what to do.
Thanks a heap in advance guys.

-Ant