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Update Google Nexus 7 to latest Android 4.1 JRO03S firmware

The JRO03S firmware is the latest Android 4.1 Jelly Bean firmware that has been leaked for the Google / ASUS Nexus 7 device. Use this post to learn how to manually flash the update in under ten minutes.

This is a firmware that is installed on newer Nexus 7 devices, but it wasn’t pushed for older devices and that is why ‘jamesst20’, an XDA Senior Member, bundled it for you to experience the latest Jelly Bean 4.1.1 OS functions and features right on your device. This update will work only with older Nexus 7 devices and in order to correctly flash this update, you will first need to read the preparation guide; it can be found several lines below.

Android 4.1 JRO03S official firmware by Google can be installed with CWM Recovery and you should firstly backup all your files and move them on your computer. This update comes with several bugs and errors fixed and you should be able to flash it in under ten minutes.

Before you can move to the tutorial, you should firstly prepare your PC for the updating process. Read the entire post and only when you’re sure that you know what you’re doing, you should begin to update your ASUS / Google tablet. Here’s what you need to know before moving to the ‘how-to’ guide:

  • Install the JRO03S latest Jelly Bean firmware only on the Nexus 7 tablet. Do not attempt to flash this update on any other Android devices.
  • If your device is rooted, then you should use CWM / TWRP Recovery to create a NANDROID backup of your currently installed ROM. This will be useful in case you don’t like the new update or something goes wrong and the device doesn’t boot up normally after your install JRO03S firmware.
  • All data files should be moved on your device’s internal SD card. This part of your tablet will not be wiped in the update process.
  • Charge the tablet’s battery until it reaches at least 50% power level. This will prevent it from powering off while you’re flashing the new firmware update.
  • Your device should be rooted and have its bootloader unlocked. Without these requirements being met you will not be able to flash the files listed in this post.
  • Enable USB debugging option from your device’s Android Development menu.
  • Do not attempt to flash this update if you’re a beginner when it comes to work with CWM Recovery.
  • Note that we cannot be blamed in case your device gets damaged in the process. You’re taking a risk at your own expense and that’s why you should only attempt to flash teh JRO03S firmware if you’re an advanced user.
  • Do not skip any steps that I have listed in the tutorial.

I think that these are all the instructions that you had to read prior to moving to the firmware updating guide. In case you cannot update the tablet, then you should post a detailed comment at the end of this post and we will try to help you.

Install the latest JRO03S Jelly Bean 4.1.1 Firmware on your Google Nexus 7 tablet:

  1. Download the  JRO03S zip firmware file from HERE.
  2. Connect your tablet to your PC via USB cable and move the ROM zip on its internal SD card. Do not extract the contents comprised withing the zip. When the file is moved successfully, you should unplug the device from PC.
  3. Switch off completely the Nexus 7 device. Now boot into CWM/ TWRP Recovery mode. It can be done by pressing ‘volume up’, ‘volume down’ and ‘power’ buttons at the same time. Release the buttons when the tablet’s screen powers on.
  4. When you’re at the first custom recovery screen you should select ‘backup and restore’ option. Create a full backup of your currently installed ROM. In case you already made such backup, then you should skip this step.
  5. Now select ‘wipe data/ factory reset’ option and confirm its actions. When this process is complete you should continue to the next step.
  6. Next, select ‘install zip from sdcard’ and from the next menu select ‘choose zip from sdcard’. Browse your tablet for the Android 4.1.1 JRO03S stock zip file. Confirm its installation.
  7. When the ROM installs successfully, you have to return to the main recovery menu. Select ‘reboot system now’.
  8. Wait for your device to successfully load all the new firmware files. This shouldn’t take longer than 5 minutes.
  9. When the firmware has been installed, you should simply enter your Google Account details and then you’ll take full control over your phone once again.
  10. That’s it, you’ve successfully flashed all the new JRO03S firmware files. Test the new ROM and tell us in comments if you find any bugs.

I think that these were all the steps that you had to take in order to update your tablet device. I hope that you’ve managed to flash all the files.

NOTE: In case your device gets stuck at the boot animation screen or in case it gets into a boot loop, then the Jelly Bean firmware update wasn’t installed successfully and you should power off the device completely and then repeat the entire tutorial. Eventually you will manage to apply all steps correctly and your Nexus 7 should boot normally with this new ROM.

If you hit any other roadblocks, leave a comment at the end of this article and explain where you got stuck and what other actions you took before beginning the installation.

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