Well a FAR easier method is to actually simply RESTORE EEPROM from your chip back to the Xbox itself, see the EEPROM menu for that. Within that menu you ALSO have a Fix EEPROM option, that 'can' sometimes work.
If you have a copy on your PC's HDD, then use SmartXX's own RemoteFlasher v5. Using this you can simply load the EEPROM into this, and replace the EEPROM on your Xbox directly using that. If your EEPROM is on your Xbox's HDD then yes just use Ed@Chip.
If you connect to the SmartXX using a web browser you can actually see an archive of the last 5 EEROMS used, maybe one of these is your EEPROM and you can simply regress back to it. Click the desired EEPROM and it's copied to your PC, simply add this to RemoteFlasher and copy it directly back to your EEPROM.
For further information to use these programs, move to the official forums hosted by SmartXX (www.smartxx.com/forum/) and find my 'SmartXX Usage Manual' on the forums there (it's linked via my sigs on the site).
Basically thanks to the features of SmartXX's OS, there should never be a need to ever use the likes of Flashbios or Config Magic ever again.