Google has released the Jelly Bean version of Android 4.1 in Google IO event 2012.Now Google has started rolling out the update for all the ICS enabled device to get the Jelly Bean version OTA(Over the Air update).This update will be released to the Nexus which is Google has released recently.But this Jelly Bean release is just for preview for Nexus devices.This update we can get in OTA or there is a seperate link has given to download the Software.
As per the Android Police,GSM device which is running with firmware version of IMM330D will eligible to get the Jelly Bean update.So this update given to some specific version of firmware in the smartphone industry.Because Jelly Bean needs the updated version of firmware for smartphone devices.But this Jelly Bean will not available for Samsung Nexus previous version of smartphone.