The International version of Galaxy Nexus smartphone has received a new leaked and unofficial update to the Android 4.1.1 firmware and, by using the instructions listed in this article you will learn how to install it without waiting for the OTA Release. This ROM should be used for testing purposes only and you should create a full Nandroid backup of your phone.
The smartphone should be configured correctly before moving to the tutorial and for this you will need to read the guidelines listed under the preparation guide. The Android 4.1.1 Jelly Bean build number JRO03C has been leaked and bundled by the guys at XDA and, now you can install it on your device. In the next weeks there should be multiple other firmware releases for the devices that are currently running only the Ice Cream Sandwich.
The guidelines below will teach you what steps you need to take so that you’ll manage to set your device and install the firmware update at your first attempt. JRO03C is based on the latest Android 4.1.1 OTA update release by Google and now it can be installed on your I9250 International variant of Galaxy Nexus smartphone. Here’s what you need to do before moving to the tutorial’s first step:
- the how-to guide features a step that tells you to wipe all phone data, but this should only be applied if you’re coming from the 4.0.4 ICS firmware. If your phone is now on 4.1 Jelly Bean then you can choose to skip the wipe data/ factory reset step, but make sure to apply the ‘wipe cache and wipe dalvik’ steps.
- This tutorial should be applied on devices that are already rooted and running the TWRP Recovery.
- The Galaxy Nexus I9250 should have its bootloader unlocker. If yours doesn’t, then use this guide here.
- Install this unofficial Jelly Bean JRO03C only on I9250 International variants of Galaxy Nexus.
- Enable USB Debugging from your smartphone Settings menu.
- Make sure that the battery power charge level is over 70%. You wouldn’t want for it to switch OFF during the update process.
- If you want to save applications, SMS, Call Logs info and the APN Settings then you should use these programs: AppBAK for Android apps backups | SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. If you wipe your phone data then you should use these apps as otherwise you will lose the data stored on them.
- Sync the phone Contacts with the Gmail account assigned for your GNex device.
- This guide should be completed by an advanced Android user. Note that we cannot be held responsible in case your phone is bricked during the update.
How to update Galaxy Nexus to Unofficial JRO03C Firmware
- Download the Jelly Bean JRO03C firmware zip file HERE.
- Connect your GNex to your PC and move the ROM zip file on its SD Card. Don’t extract its contents.
- Power OFF the smartphone and boot into recovery mode. Press the ‘volume down’, ‘volume up’ and ‘power’ buttons until the display powers ON. Select Restart Recovery, press Power and wait for the phone to load all custom recovery image files.
- When in TWRP Recovery Mode you can create a full backup of the currently installed ROM by using the Backup menu. When done, return to the main recovery menu.
- If you’re coming from an ICS 4.0.4 firmware then you should wipe all phone data by selecting ‘wipe’ and then ‘factory reset’. Confirm the process and remember that this won’t delete the contents stored on the internal SD card. The Android 4.1 Jelly Bean doesn’t require data wiping and you should skip this step.
- Next, select ‘Install’.
- Navigate and point the custom recovery menu to the JRO03C zip file. It is the file you moved on the SD Card at step 2. Confirm the installation.
- When the Jelly Bean 4.1.1 firmware has been completely installed you should apply the ‘wipe cache’ and ‘wipe dalvik cache’ actions.
- That’s it, now you should select the ‘reboot system now’ option and your GNex will boot into normal mode with a stock Jelly Bean 4.1.1 OS freshly installed.
The first boot process might take a while and you should wait at least 10 minutes before taking any other action. If the phone freezes at the boot screen you should remove its battery and then re-insert it and repeat the tutorial guide steps.
If you cannot complete the installation, use the comments section to tells us exactly what steps you took and where you got stuck, we will help you install the new Jelly Bean JRO03C update on your Galaxy Nexus phone.