Earlier this morning, we took a look at how Samsung rolled out the Android 4.1 Jelly Bean source code for international versions of the Samsung Galaxy S3, and folks who are rocking to powerful but yet not the latest Android smartphones, there is hope for you yet. Especially so if you are rocking to the Samsung Nexus S or the Nexus S 4G. In fact, Google has just rolled out factory images of Android 4.1.1 Jelly Bean for both the Nexus S and Nexus S 4G today, where these images can be flashed onto your respective smartphone so that it can return to the original factory firmware just in case Murphy decides to strike and your handset ends up bricked.
Needless to say, it would be prudent to stash away the factory image in a safe place, as you can never quite tell just when you need it. Like most of the other things in life, you cannot quite find them when you need it the most, so being prepared is always a good mantra to live up to. The Google Developers page has more information on the Android 4.1 Jelly Bean factory image if you are interested to know more.