Ever since the launch of Android 4.4, all those who had older phones with older Android OS, hoped that the phone maker will launch the latest update for their phone, but not, you are very happy if you buy a phone launched in the current year, and if you receive for your phone the next update announced.
For all of us, thanks to xdadevelopers can update almost devices with old operating system. Recently, on xdadevelopers forum appears a new topic about, how to install Andoid 4.4 for Xperia Arc S, Xperia Arc and Arc Pro.
If you want to change the current OS for your phone, you must know that is not official and will lose the phone warranty. Also, you are the only responsible for your actions.