The Android 4.1.1 Jelly Bean firmware update was released for the Galaxy Tab 2 10.1 GT-P5100 about a month ago. The first batch of the update was made available via Kies and Over-the-Air to the users of select countries and networks. As the time passed, more users got the update. But if could not update your Galaxy Tab 2 10.1 P5100 yet and are willing to install the update manually on to your device, here are some firmwares for the Tab 2 that you can download and install using Odin flasher.
The available firmwares fall into two classes- the branded ones that are meant for Galaxy Tab 2 10.1 model number P5100 locked to a specific carrier/operator, and the unbranded ones that can be installed on any non-carrier-branded or international model of the device.
The Android 4.1.1 Jelly Bean update for the Galaxy Tab 2 10.1 GT-P5100 brings many new features and improvements in user interface speed and better battery-life. Among the changes you will notice having updated your Tab 2 to Android 4.1.1 are: Google Now, smoother UI (thanks to the Project Butter), improved TouchWiz, new enhanced Notification Panel, Blocking mode, apps like Play Movie, Play Books, Play Magazines, new image view modes in the Gallery and so on.
Download a firmware that suits you the most from below. If you do not see the name of your country, you can download any firmware that is not meant for a carrier branded Tab 2 P5100 and install it on your device but your Tab should also be unlocked one.
Download the firmware you like, extract the zip and follow the instructions given here.
Here is a short but easy tutorial to help you flash Android 4.1.1 Jelly Bean firmware to your Samsung Galaxy Tab 2 10.1 WiFi GT-P5100 . Just follow the procedure and you will be able to install the new firmware easily.
On rebooting you will have the new Jelly Bean firmware on your Samsung Galaxy Tab 2 10.1 WiFi. Enjoy and let us know how it works for you.