Ok guys, listen up. This is what I did...

had 2.01, downgraded to 1.5, then 2, then 1.5 again.
downloaded devhook, downloaded 2.5 fw
used a pbp unpacker to get that psar from the 2.5 fw
put the 2.5 psar in the root, everything else from devhook in the appropriate place.
load up psp. load up devhook fw installer, follow the prompts
load up devhook sample launcher and do all the settings mentioned previously. u now have 2.5
if u turn off the psp u have 1.5 again, if u run devhook sample launcher u have 2.5 again
simple