1. Install the ROM Manager on your LG Motion 4G MS770. Get it from Android Marketplace Location, then install the clockwork mod recovery.
2. Connect your LG Motion 4G MS770 to your PC employing the USB information cable. Copy the “LG Motion 4G MS770_4.1 Jelly Bean.zip” file you downloaded to the SD memory card.
3. Restart your device in the recovery mode using ROM Manager. As soon as in Recovery Mode, go to ROM Manager and select backup / restore to back-up your information.
4. From the Recovery Menu do a total data erase (including Delvik Cache). When completed, go back to Recovery Principal Menu and choose Flash ROM from SD Card. Navigate the location you copied the ”LG Motion 4G MS770_4.1 Jelly Bean.zip” file and follow the directions for installing Android 4.1 Jelly Bean on your LG Motion 4G MS770. As soon as the installation is over, just reboot your LG Motion 4G MS770 device, and here you go, you’ve just upgraded it to the new Android 4.1 Jelly Bean . Thank you for visiting Upgrade/Update LG Motion 4G MS770 to Android 4.1 Jelly Bean
Note : Here Is Link To Download the ROM/Zip File : http://adf.ly/QIdiI