Right on the heels of the Galaxy Note 3 launching with Android 4.3 on board, a prerelease build of Android 4.3 for the Galaxy S4 has leaked out. The version that surfaced is a test firmware and is known as build version I9505XXUEMI8. It is compatible with the GT-I950 Galaxy S4.
Those who have had the pleasure of using the update say that it is faster than Android 4.2.2 and is lag free. Secure business application Samsung Knox is present along with Samsung Wallet.
Software versions such as this one could potentially cause problems with the device, so anyone intending to install it should do so with extreme caution. Users that do decide to test it out should back up their entire handset.
Keep in mind that this is not the finished version of the update and more features could be added before it is complete.