How to Change android Mobile version in any android device?
It is too easy to do
Just download ES File Explorer from play store it is free.
then open it
then click on option button and slide down and on root explorer and grant permission
then click on Root Explorer and then click on Mount R/W and then convert evry thing in RW
then press OK
now click on top at Homepage
and click on device
then open system
then click on build.prop
open with ES note Editor
then click on option and then edit
then you can find a line ro.build.version.release=4.1.2 or your version then change this 4.1.2 to 4.2.2 or whatever you want
then press back and then click on yes and then reboot your mobile.
Now go to setting and then about phone.
you can see your android version has been changed :)