Hi, I have an so image of a live cd which when booted will perform the following actions :

scan for bluetooth devices and send them files

Now the files that it send are images and videos, and i want to change them, that is put my own content into it. I tried mounting the cd in Fedora core 6 copied it content and then mounted the filesystem and modifies the contents. But when i unmount and gzip it and make an iso and burn it , it doesnt work.

Can someone tell me complete step by step guide to modify this iso.