Work like a charm.It's weird because my Xbox really has 4GB of internal space.
I Followed instructions for Xell GUI Corona 4g, generates an image of +/- 49mb making the "size" error while flashing nand, so I iguinored and made again but just setting imput/output and take cpukey by file that this program generates. Auto detected everything and generate the correct +/- 17mb image...
I'm confusing something?
Thank you for the solution anyway.