The latest Android 4.1.1 Jelly Bean firmware version for the Nexus 7 is JRO03S, Google hasn’t rolled out the this firmware update to all Nexus 7 tablets, just a few of them has just received the OTA notification, but a senior XDA developer member jamesst20 has released this JRO03S build for Nexus 7 as a ROM, here’s step by step guide to install JRO03S ROM on Nexus 7.
Do keep in mind that the bootloader must be unlocked and ClockworkMod recovery should be installed on your Nexus 7, you can use this all-in-one WugFresh toolkit to unlock bootloader and install ClockworkMdo. Be sure to make a backup of your device data such as SMS, internet setting, contacts music files etc because the below procedure may wipe data, you can sync your contacts with Gmail account and for messages use SMS apps, lastly use file expert app to backup apps.
DISCLAIMER: Please proceed the below guide at your own risk, Android Egis will not be held responsible if your device lost data or gets damaged following this guide.
Step #1: Download the Android 4.1.1 JRO03S ROM to your PC.
Step #2: Transfer the downloaded file to your Nexus 7.
Step #3: Turn the device off.
Step #4: Reboot the device into recovery mode by holding down volume up, volume down and power buttons.
Step #5: In recovery mode, create a nandroid backup of your current ROM, it’s important because if anything not work out that you expect from this ROM, you’ll be able to easily revert back to your current state. To create backup select “Backup and Restore”, and then select “Backup” again.
Step #6: Perform full wipe, first select the wipe data/factory reset, and confirm on the next screen.
Step #7: Return to main menu by selecting “Go Back”.
Step #8: Select “Install Zip from SD Card” then “Choose Zip from SD Card” and locate the downloaded Android 4.1.1 JRO03S ROM .zip file that you’ve transferred in above step and confirm installation. Wait till installation complete.
Step #9: Once the installation is completed, select “Go Back” after that select “Reboot System Now” reboot the phone.
That’s it, you’re done, the ROM is now installed on your phone, if you faced any issue, do comment below!