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[shambles1980]

1st this has nothing to do with executer mod chips.
2nd this has nothing to dow ith the original xbox.

So you may want to try asking in the xbox 360 section.

but the stock firmware can be found in the usual places.
and yo flash back to stock before you update your dash so you dont get flagged or get an error message.
if you didnt get flagged, and it did update chances are it flashed you back to stock any way.