Galaxy Tab 2 7.0 comes with the ICS stock rom 4.0.3, this is currently upgradeable to Jelly Beans 4.1.1 via Kies OTA update from Samsung. However Jelly Beans update is only partially available officially on the Wi-Fi device on selected countries. The 3G version of this update recently leaked from Samsung servers in India for the base firmware P3100DDBLH3 this is just a test release and may still improved when Samsung finally release the official version. If you are too keen try this on your device to experience the performance enhancement offered by Jelly Beans and the Android Project Butter then now is your chance to try it even before it becomes publicly available to the majority of Android folks.
This update requires a very specific version of the firmware P3100DDBLH3 for (GT-P3100) so make sure you have it in your device before flashing the OTA update. If you don’t have it, it’s still possible to upgrade your device by flashing the base firmware first (this will essentially replaced your base firmware so it can be flashed with the OTA update) and then proceed on flashing the OTA update: