Xperia J ST26i/ST26a runs on Android 4.0.4 out of the box and is updated to Android 4.1.2 Jelly Bean later, but hasn’t received any major Jelly Bean Updates like Android 4.2 or 4.3, so from this we come to know that Android 4.4 Kitkat update is not expected to receive on this device. If this disappoints you then don’t worry, we have brought a way to update Xperia J ST26i/ST26a to Android 4.4.2 Kitkat firmware, and it is done with the help of Custom ROM. The ROM which we are going to use for our needs is CM 11 ROM.
CM 11 for Xperia J is based on Stock Android 4.4.2 Kitkat and is smoother and faster. Besides this it contains no bloat ware and is battery friendly and also provides freer RAM for the smoother performance of the device. It also packs some of the security enhancements.
Before we proceed to update Xperia J ST26i/ST26a to Android 4.4.2 Kitkat firmware, let’s have a quick look at some of the pre requisites to follow, to prepare Xperia J ST26i/ST26a for the installation process and also to avoid them from bricking.