ShadowC has nothing to do with LIVE, it is to prevent ms dash updates from damaging your exploit.
IMO=In My Opinion.
PBL =Pheonix BIOS Loader.
Download PBL Meetoo, and setup the bios to point to your current dashboard.
Then place them in your apps folder, and when your xbox boots, go into your apps, and run it, if its setup properly you will be at your dash again, but this time you will have access to your real C and be able to delete or move or copy uoir shadowC.img.