1. Install the ROM Manager on your Lenovo IdeaPhone P700i. Get it from Android Marketplace Location, then install the clockwork mod recovery.
2. Connect your Lenovo IdeaPhone P700i to your PC employing the USB information cable. Copy the “Lenovo IdeaPhone P700i_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 ”Lenovo IdeaPhone P700i_4.1 Jelly Bean.zip” file and follow the directions for installing Android 4.1 Jelly Bean on your Lenovo IdeaPhone P700i. As soon as the installation is over, just reboot your Lenovo IdeaPhone P700i device, and here you go, you’ve just upgraded it to the new Android 4.1 Jelly Bean. Thank you for visiting Upgrade/Update Lenovo IdeaPhone P700i to Android 4.1 Jelly Bean