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How to install Android 4.2.1 JB Slim Bean Beta 1 ROM on Nexus 7 3G

The Slim Bean Beta 1 custom ROM based on Android 4.2.1 Jelly Bean has recently been released for  ASUS Google Nexus 7 3G. Earlier last week, it also received a good treatment from another developer group as the official CyanogenMod 10.1 Jelly Bean-based ROM was released. While these two ROMs come with a lot of cool features, the main difference is the size. Slim Bean ROMs are well-customized and repackaged to be smaller in file size but faster in performance.

Slim Bean ROMs have always been receiving good feedbacks from people who take the risk of flashing unofficial firmware into their devices. This build, albeit nightly, is already stable. However, developers behind this awesome ROM warn there could be other components and features that won’t work. So, they ask for active participation from users to report anything unusual while running this firmware. Now, for those who want to try it out, here’s a step-by-step tutorial on how to install Android 4.2.1 JB Slim Bean Beta 1 ROM on Nexus 7 3G.


  1. Make a backup of all of your data including contacts, SMS messages, files, videos, etc… Here is our guide on how to backup data on any Android device. [link here]
  2. Verify that your device’s bootloader was unlocked and that it has been rooted with Clockworkmod Recovery installed. Here’s our guide on how to root your device and install CWM recovery.
  3. Check if you have sufficient battery left. At least, 85% of battery is required to make sure your device won’t power out during the process. There is a high possibility that your Nexus 7 3G will be bricked if the process is interrupted.
  4. Enable USB Debugging in your device and check if all necessary drivers are installed in your computer. You can download USB drivers from here.

Disclaimer: You can neither blame The Droid Guy nor developers of ROMs and mods presented and used in this tutorial. It’s on you if you continue installing this Slim Bean build for Nexus 7. Instructions provided here are meant for informational purposes only and do not cover any warranty claims.

Files to Download

You will need to save these packages into your computer as you will be copying them into your device later.

Step-by-step Tutorial

Step 1: Connect your Nexus 7 3G to your computers using the USB data cable and copy Slim Bean Beta 1 ROM and Google Apps packages into the root directory of your device’s internal memory. Make sure you never save them in any folder as they will become undetectable by ClockworkMod Recovery. Once you’re finished copying them, you can disconnect your device from your computer.

Step 2: Turn your device off and reboot to recovery mode. You can do this by pressing and holding Volume Up, Volume Down and Power buttons together until the display turns on. Volume keys are used to navigate while the Power button is used to select options in recovery mode. Do this step over and over in case your device boots in normal mode.

Step 3: In case things go bad during the process, you need to take a Nandroid Backup of the current ROM in your device so you can install it later. Select Backup and Restore in the recovery mode, then Backup. After which, you need to return to the main menu to continue the installation.

Step 4: Choose Wipe Data/Factory Reset to clean out all data. Don’t forget to confirm your action. This process may take a minute or more to complete depending on many data are to be wiped out.

Step 5: Now, choose Install Zip from SD Card followed by Choose Zip from SD card. You need to browse through the root directory of your SD card where you saved both Slim Bean ROM and Google Apps. You need to install the Slim Bean ROM first so choose that. After the installation, repeat this step once again and this time around, choose Google Apps package.

Step 6: Once the installation of both packages is done, return to the main menu and choose Reboot System Now. The first boot after the process may take a little longer than the normal booting time but you need to be patient and leave your device alone until it is fully active.

Congratulations! You are now running Slim Bean ROM based on Android 4.2.1 Jelly Bean OS for Asus Google Nexus 7. Let us know by leaving comments below if this tutorial helped you.

[source: XDA Developers]

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