Xbox 360 backup PLS HELP!

I just got my xbox flashed :smiley:
But when i burn a backup with imgburn I just get the XBOX 360 screen,
and with clonecd i get the To play this disc put it in an xbox 360 console.
I did everything layerbreak, abgx, I tried 2,4x and 4x speed, but it just won’t work. I already wasted 3 dl. I’m using Verbatim DVD+R DL and i have Optiarc DVD RW AD-7240S dvd drive. PLS HELP!!!

Have you looked at the last page of this thread? It seems to be quite a complex subject, and I have no idea if the information in there is still up to date.