sorry, from CWM its /dev/block/stl5
and to set permissions on that file if you have any issues:
adb.exe shell chmod 600 /dev/block/stl5
adb.exe shell chown root:root /dev/block/stl5
if you're handy with a hex editor you can do an esn repair just by changing stl5 (the nvdata, I assume, for the prevail) just hope you don't mess up like I did.
EDIT: also, 000ing out the locations and trying to nvrequestitem write doesnt work. You have to find the reversed meid/esn, and input your meid/esn (reversed).