Folks at XDA have uploaded official stock Android 4.1.1 firmwares for the Samsung Galaxy Tab 2 7.0 tablet that can be flashed via ODIN. This is useful for those who have not yet received official Jelly bean (Android 4.1.1) operating system.
Download the firmware from here. Few things to keep in mind though – if you are coming from custom firmware, first reboot into recovery mode and wipe data, cache and dalvic first and then flash the ROM using ODIN that can be download from here. Also check out how to downgrade to ICS on Tab 2 7.0.