I have a Samsung Nexus S, unlocked for Wind Mobile. I'm using this in Canada 1.) Model Number: Nexus S 2.) Firmware Version ? 3.) Baseband Version: 19020XXKL1 4.) Kernel Version: 3.0.8-g6656123 android-build@vpbs1 #1 5.) Build Number: IMM76D I recently bought this off Craigs List... not sure whether it was rooted or not (don't know how to find out). Anyway, I received the JB OTA update today, downloaded it, and when I clicked reboot and install, a little standing green android with a yellow exclamation mark appeared and it stayed like that for a very long time. I ended up having to pull the battery out. When I restarted the phone it was still on ICS 4.0.4. I then tried to update a few more times with the same problem. At the moment, I downloaded the Jelly Bean and clicked "Install Later" until I can figure this out. Any help would be greatly appreciated! Thanks!