I'm a total noob so please don't flame me.
I thought it would worth letting people know a problem I found with the PSP downgrader to 1.50
I spent over 2 hours without success till I discovered that the OVERFLOW.TIFF file used in the download linked on this board are 25x25 in size.
I then found a OVERFLOW.TIFF file that was 8x8 and installed that instead and everything worked perfectly.
I have seen several other people asking why their system freezes after following the instructions to a "T" and then shut off. THIS IS THE PROBLEM and if you replace the OVERFLOW.TIFF file with teh 8x8 you will have no more issues.
IF this was previously posted by someone I apologize I only wanted to help as this was a big headache for a noob like me and I know that many others had the same issue.
If you could please add this note to the FAQ it would be appreciated