Home + L/R trigger for changing ISOs?

hi, i downgraded a friend's psp to 1.5 from 2.6... now its running 3.03b, because thats what's on my PSP. on the memory card, i have a ISO folder in the root, with some ISOs in it.. and on MY psp, I can press home + R/L triggers to change the ISO loading in XMB as a UMD... which plugin was this? or how did I get it to work? any help will be much appreciated.

[DarkPacMan77]

It's no longer needed b/c ISO's are loaded directly off of the XMB.

-DarkPacMan77-

Yeah, I figured it out, it's under game>memory stick now. I was confused when it didn't load as a UMD.