THIS IS NOT MY WORK...I AM SIMPLY PROVIDING A LINK TO THE COMPLETELY STOCK JELLY BEAN ROM. AGAIN, THIS IS NOT MY WORK OR LINK.
ALSO, THE FILE NAME SHOWS "TAKJU" WHICH IS THE USA GALAXY NEXUS (THAT IS PURCHASED FROM GOOGLE PLAY STORE), SO I'M NOT SURE IF IT WILL WORK CORRECTLY ON ANY OTHER UNLOCKED NEXUS' (LIKE THE YAKJU). I AM NOT RESPONSIBLE FOR ANY DAMAGE YOU MAY DO TO YOUR PHONE.
Having read all the information above, here is the link:
I simply used the galaxy nexus toolkit (see sticky thread in this section) to unlock my phone and flash CWM (I didn't need to root), and then flashed the stock JB via CWM.