80020321 error when running cso

a buddy of mine is trying to run MACh and Bubble Bobble for psp. Bubble bobble was an iso and he compressed it to cso. MACH was cso originaly. All the settings in registry were fine. Using 3.40 OEA. Could there be a problem with trying to run it in cso format? and also what program for compressing isos would be the most reccomended?

[DarkPacMan77]

.cso is the only compression that I know of for custom firmware. I heard of a "smarter" .cso compression before, but I've never personally used it. Also, yes, there COULD be a problem with the format the file is in - though I don't think there would be.

Google "80020321" and see what shows up - I guarantee someone has had that problem fixed on another site somewhere

-DarkPacMan77-