I got it to work on slim!
Running 4.01m33-2 on my Psp slim. Settings on 4.XX with m33 no umd loader.
I found this program (attachment below), I was searching around and found this. eLoader v1. Its simple to use, copy it to your GAME folder, put both Guitarway to Heaven folders in this same folder. Run the eLoader, a screen will come up. Scroll down the list to Guitarway To Heaven and press X. The game should load up.
I found this here: http://forums.exophase.com/showthread.php?t=3540
Use the file below to ensure that this will work!
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