do this Backup your data, in external sdcard.
Require root ( I do it with towelroot
Download rar file(Digital Minds V2 - Live) and extract
Copy the system folder to internal SD card root ( copy including the system folder , dont just copy the img file )
Make sure you have adb(find in gp2.rar) and the USB drivers(LG United Mobile) and debugging enabled(tap (7) times to About phone/Software information/Build number, go back to Settings/ Developrment options/ check Usb debugging) ,and
Run the script (Install ROM .bat),grant ADB root permission on the phone and sit back and relax for about 3-4 mins , once done,