This tut will teach you how to properly burn ISO games of xbox360. Use UMDGEN to add the new EBOOT.BIN to the iso and save it.Then with the new iso file follow the steps from 4 to 8.Run the should write "Save Eboot.BIN.".Press any key to close the window.Use UMDGEN or Winrar to extract PSP_GAME/SYSDIR/EBOOT.BIN(if there is EBOOT.OLD extract it instead and rename it to EBOOT.BIN) from the iso to the folder containing seboot.bat.Try running the game-if it runs normally you're good to go.If not continue reading.
Unrar the archive downloaded in some directory on your PC.Note:It must be 728 Mb at most(if it is bigger than that you will have to rip it) Get the iso (if cso you must convert it back to iso) of the game U want to sign.