This is a windows version of xbedump i slightly modified to recalculate the xbe signature of any xbe file to use with the dayX font exploit.
Xbedump was written by [email protected] from xbox linux, and was based upon the original XBE Dumper by Michael Steil ([email protected]).

To use this tool do:
xbedump default.xbe -font
this will make a file called 'out.xbe' which has a valid signature in it. Rename this to default.xbe and you are ready to go!
(btw this must be used in conjunction with the font exploit, below, and only seems to work with early version xboxs...)