How to play new games on v1.5

I have a downgraded version 1.5 PSP and I just bought Loco Roco.
How do I play it and other new games on my PSP.
I've heard of UMD loaders and Devhook, but am not clear it that's what I need.
Could someone point me in the right direction?
Thanks,
Sam

go to PSP-Hacks dot com and get Devhook.
there is even a windows installer version...
very simple....

Go on psp-hacks.com like Russ said, then downloads>firmware>firmware emulators>Dev Hook ultimate installer

Oh and I can confirm Loco Roco works with it.

Oh, LocoRoco works. My wife f'n loves it!. I'm a Gangs of London fan myself. Gotta love DevHook.