how can i fix a failed update error on my 360

OG: I have a falcon retail with the update error how could this be fixed with j-programmer ?

Ok so i have tried to update with a usb and with the dashboard files with the correct update still nothing..
http://www.youtube.com/watch?v=IZfqf...ature=youtu.be


New question: so if i was to install a coolrunner and write xell would it boot into xell that is now my question ?