Updating it on our side, it may not possible.. There may be possibility of updating it through custom kernel or so, I can't say anything about it..
Nokia 5233 (At home)
Nokia 5230 (Broken Display)
Sony Xperia L (Stock 4.2.2, Rooted, ThunderZap 3.1-Lite)
Ex-Symbian Modder, new to Android world
Hit "THANKS" button, I appreciate it..