Brewology

i am runnig a psp with 3.52 firmware,and the games i have in iso format seem to work fine.
but i have had a few which dont work(sega rally being one,it just gets to the sega logo and wont go any further.
Now i was told that if this happens i should place a umd in the psp and then it would work.
My question is would any umd work ie a demo disk?
as i have no umds and was just gonna buy a demo disc if that works.
or do i need a proper game????
Many thanks
Con

I'm not all familiar with the 3.52 M33 firmware. but in recovery there is an option that lets you play ISO files without having a UMD disc in your PSP. But It might not work with all ISO files, so you migth need a UMD. The UMD can be anything, it doesnt have to be anything specific.

as advent mentioned, there is an option in recovery mode which allows you to play without a umd. But as for compatable umd's, only game or game demos will work. movie umds wont work.

thanks for the help

Con