are you into the homebrew?
if not just upgrade to 2.0
or if you like the homebrew try this... i havnt tryed it but someone just posted something about it
http://www.psp-hacks.com/file/179
just search around that site
or this one
http://pspupdates.qj.net/
just look around
i've seen a couple programs in which can fool your PSP
making it think its FW2.0 or 2.5
en