Check this tutorial to install Android 4.1 on Sony Xperia X10 via CM10 firmware.

However, users can also download the firmware and update their devices manually. Here is a tutorial on how to upgrade the Galaxy S4 LTE to the Android 4.4.2 KitKat I9505XXUGNE5 using Odin.

Step 1: Download Android 4.1.2 XXAMD6 Jelly Bean official firmware for Galaxy Grand Duos I9082 and Odin v3.07 on your computer.

Here's a tutorial for installing Android 4.2.2 Jelly Bean firmware updates, region by region, for the Samsung Galaxy S4.