Well I am willing to try this out to help other people. If I brick my PSP I will let you know.
All I need is a little help from someone with 1.5 firmware. What you need to do is take a clean PSP, this means no flash edits. Install XFlash and choose Debranded Gameboot. Also, do one with just Debranded Intro.
After doing so, just send me the two opening_plugin.rco files. One with the debranded gameboot, the other with the intro.
I believe this file can be found at \ms0\PSP\GAME\XFlash\flas h0\vsh\resource\
So if anyone wants to help out that would be great. Im just trying to get it to work on a 2.71 SE firmware. If I do, I will let everyone know how :)