Restore a softbricked Epic 4G using Odin to go back to stock factory EB18.
Odin - http://www.mediafire.com/?g5j0if1mdly6a2r
EB13 Tar - http://www.multiupload.com/3YPCROH00T
You can find the rest of the files you need on the Viperrom Wiki Site - http://teamviper.devphone.org/wiki/index.php?title=Guides#How_to_Flash_Stock_.28DI18.2FDK28.2FEB13.29
Please note I am not responsible for any damage to your phone, remember you root and flash at your own risk.