Unlock the large drive with the original xboxhdm CD (boot, select option 3, then type unlockhd -a)
Build a new xboxhdm CD with the new eeprom, then lock it (boot, select option 3, then type lockhd -a)
You might need to redo the softmod if the original softmod was kernel specific. In that case after you have unlocked the disk, follow the link in my signature - "build a new softmod disk with eeprom"
This post has been edited by Heimdall: Nov 24 2010, 09:57 AM