Well that certainly didn’t take too long. A month after announcing Jelly Bean at their annual I/O conference, Google has released stock Jelly Bean Factory Images for the Nexus S, Nexus 7, and GSM (maguro) Galaxy Nexus. Unfortunately, the Sprint Nexus S, and the Verizon & Sprint Galaxy Nexus’ did not see releases.
These Factory Images will help you restore your phone back to full stock in case anything should happen to your phone while modding it. As always, we recommend all you Nexus modders out there to have this file on your computer in case anything goes wrong. You never know.