i deleted mine.
i used the wideawake's extended rom tool which unlocks the extended rom. once you have installed the cab and ran the .exe from the zip file, do a soft reset your phone. an extended rom folder should show up in your file explorer. from there, you can cut and paste all of sprint extended rom files on to your memory card or pc and replace them with your own. just remember to modify the config.txt and save it as a "read only" file. also, save all of the cabs your extended rom as a "read only" file.
check out this post, if you need anymore help.
http://ppcgeeks.com/how-to-customize...rom-t1395.html