@ biggnutz
Do you maybe have a Jasper with a CB version 6712?
If so, check my post here:
http://team-xecuter.com/forums/showpost.php?p=277252&postcount=22
I had the same problem - soldered the Jasper, read the NAND, wrote Xell and then - NOTHING.
Box didn't power up (no button worked), only worked again after reflashing the original NAND.
I think there may be a bug in JTAG Tool for this CB version of Jasper.
Because if you flash Xell manually with NANDPro with the right Xell-Image everything works fine.
Give it a try...