1. Install the ROM Manager on your Icemobile Galaxy Prime Plus. Get it from Google Play Store, then install the clockwork mod recovery.
2. Connect your Icemobile Galaxy Prime Plus to your PC employing the USB information cable. Copy the “Icemobile Galaxy Prime Plus_4.2 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 ”Icemobile Galaxy Prime Plus_4.2 Jelly Bean.zip” file and follow the directions for installing Android 4.2 Jelly Bean on your Icemobile Galaxy Prime Plus. As soon as the installation is over, just reboot your Icemobile Galaxy Prime Plus device, and here you go, you’ve just upgraded it to the new Android 4.2 Jelly Bean.