Sony mobiles today launched Firmware update for their yet another Xperia member, Xperia L. They have started rolling out Android 4.2 JellyBean update for this mobile model which brings several new features to the device along with performance enhancement and stability. You can check the new features provided by this update in the following screenshot:

If you are Xperia L user and want to update to the new firmware (obviously you must) than you can do it using Sony PC Companion or Sony Update Service (Sus). PC Companion is the default PC Suite for all your Sony smartphones that also allows you to update firmware but SUS is the dedicated software only for updating firmwares for all your Xperia devices. So i will suggest you to use the same. Also let me tell you that the update is not available as of now on OTA.