I tried all this and still couldn't use Fastboot. My fix was in BIOS. I disabled xHCI mode in USB under advanced tab and everything is fine.
JCase is looking @ this here https://twitter.com/TeamAndIRC
Wow, I'm confused. Here's what I've done:
Ran JCase's unlock method, rooted
re-locked and flashed RUU
Tried using bin file from 1st unlock to re-unlock, FAILED
Ran JCase's exploit to re-unlock and rooted again
I forget what the error...