i have a new LG optimus 2

i have a new LG optimus 2  mode LG AS680 optimus 2 with  and it came with Android version 2.3.4 and i got the phone on friday  and i was wanting too no if  Norton mobile security  would be the best for my phono and if it will work with it  how so when i do get the software  how do i in stall it on too my phono 

 

 

all so this is a little off key here  but dos any one no where i can find  the upgrade down lode too android 4.0?