Default [Q] Lg Optimus f3 reverting or adding app2sd support

Hello i am new to the whole android hacking thing and i was wondering if there is anyway to revert to an older version of android so i can install apps to sd card. Or if anyone has a working method to adding app2sd support so i can use link2sd.

My phone:
Lg optimus f3 virgin mobile
model number Ls720
kernel 3.4.0
android 4.1.2

Any info would be much appreciated.