Problems Running Jellycar/Homebrew on psp slim cfw 5.00m33-4

Hi all...

I recently managed to downgrade my psp slim 5.02 ofw to 5.00m33-4 by upgrading to 5.03, running hen and downgrading. However now im trying to install jellycar to it using sei tool and it keeps giving me the error on the psp that the game cannot start. I dont know what to do and i would appreciate some step by step instructions on what to do to get it working in easy to understand language as im only new at this hombrew business....:confused:

Thanks in advance.