could be a number of issues working against you. did you patch the image with the correct ss.bin?
Did you burn it to a good brand of media? like verbatium dvd-r dl 8.5gb
Does your burner support Bitsetting?
are you using a good burner like pioneer or lite-on?
are you using one of the newer versions of cd clone to burn the image file?
do you have the 360 with a hitachi drive or a sammy?
all of these things factor into making a working back-up you should really try to read more.
you will find out all you need to know by spending a few minutes reading the topics and post in the Technical DVD-ROM and Modified DVD Firmware Forum.
Here:
http://forums.xbox-scene.com/index.php?showforum=169QUOTE(snake36 @ Jul 4 2006, 04:13 AM)

edit:
when flashing the FW with xtreme.bat everything works fine but i get an error with deviceIOControl failed to execute flasher. It was flashing sector 90027000 (challenge response)
Thanks
soundslike a flash problem you should look into reflashing till you get no errors (such as failed to execute flasher)