from NeilR:

I tried it under iRShell and the 1.0 eboot worked under the 5.00 kernel but not from the XMB on my phat which indicated to me that it was a param.sfo issue. I went ahead and produced a cfw compatible eboot.

My attached eboot has been tested under 5.00 kernel on a phat. Simply replace this with the 1.0 compatible one from the original package.