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Google "Heimdall's Xbox Engineering Disc".  Description of what it does

Option 2.1 or 2.2 should upgrade your xbox to the latest softmod: KIngroach's or Krayzie's BUT Ndure is still state of the art as far as softmods are concerned. So unless something is broken, I don't see the point of this ''upgrade'. You are probably using one of the version of Kingroach Ndure since you took the hotswapping route with xboxhdm.