how to down grade from 2.0 to 1.5 read this!!

im sorry for my last post because i thought it was 1.00 and its 1.50 so for any people with 1.51's i thinks this will work for people that 1.5 originaly this works. if you have 1.52 and upgraded it to 2.00 you can down grade it to 1.50 i think you can anyway well here is the website.http://www.hackaday.com/entry/1234000687060851/
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did mine a few days ago, I thought i bricked my PSP when i did it but everything works fine and i'm now playing sonic, mario and street fighter on my PSP... ^_^

i downloaded the downgrade and i was doing it and when i got to the overflow.tif it said there was no file and it wont go to my memory stick. can someone tell me why?