This is truly GREAT NEWS!
You guys are so cool, figuring this problem out so unbelievabley quickly!
I did originally have a 1.52 psp but upgraded to 2.0 on the day I got it, then downgraded back to 1.5. Im glad you guys figured this out though, as I was thinking of testing this soon. Lets hope the other guys can find out a way to fix the flasher so it works on all psp's!
It would be so cool to be able to run homebrew on a custom built 2.6 psp!