Step 1: Download
FramerootStep 2: Install the apk file on your
P780.. ( Make sure installation from ..unknown sources..is checked in …system.security)
Step 3: Then open the app called
FramerootStep 4: Press on the first option. It will root your Phone
Step 5: And install
super su app from Play Store
Step 6: Reboot phone.
Done. Now You have
root access on you
Lenovo P780 Jelly Bean.