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Android 4.2.1 Jelly Bean Slim Bean ROM for ASUS Transformer TF300T now available [Tutorial]

Asus Transformer with model number TF300T has recently received an unofficial Android 4.2.1 Jelly Bean update through Slim Bean custom ROM. While fully functional, there could still be a few bugs and hardware issues with the custom ROM considering it’s still in its Beta 1 stage and still under development. Developers behind its existence, however, said the following are among the features this super lightweight Jelly Bean ROM offers: gesture typing, lock-screen widget, multi-user support, improved Google Now, photo sphere, miracast display, new daydream feature, new quick settings option, new camera app, and many more.

This tutorial, however, are intended for people who are willing to take the risk of flashing unofficial ROMs and mods into their devices. If you are one of those, then continue reading as we will guide you through on how to install Slim Bean ROM Android 4.2.1 Jelly Bean ROM into your ASUS Transformer TF300T. Otherwise, wait for the official update that might come in the following months.


  1. Backup all data inside your tablet including your contact, SMS messages, files, videos, music, etc. [How to backup data in any Android device]
  2. The bootloader should already been unlocked prior to this process.
  3. Make sure your device is rooted and that you have installed ClockworkMod Recovery. [How to Install ClockworkMod Recovery in any Android device]
  4. Enable USB Debugging in your device.
  5. Your device should, at least, have 80% battery left. Otherwise, we advise you to charge it before taking the first step of this process.

Files to Download

  1. Slim Bean Beta 1 ROM based on Android 4.2.1 Jelly Bean for ASUS Transformer TF300T [LINK HERE]
  2. Google Apps for this build [LINK HERE]

Step-by-step Tutorial

Step 1: Download the files specified above. These are zipped files but you don’t have to extract them; just save them in your computer as you will be copying it later into your device.

Step 2: Connect your Transformer TF300T to your computer using the USB data cable that came with the device when you purchased it.

Step 3: Copy the packages into your device’s internal memory. Make sure to save them in the root directory so ClockworkMod Recovery can detect them during the process.

Step 4: After you’ve copied the files, disconnect your device from your computer and turn it off.

Step 5: Boot your device into recovery mode by pressing and holding Power and Volume Up buttons until the message “Press Vol. Up to enter RCK (5s)” appears. You need to press Volume Up in less than 5 seconds to enter recovery mode successfully. Otherwise, you’ll have to repeat this step.

Step 6: It is strongly advised you make Nandroid backup of your current ROM so you can always restore it when things don’t end up the way you want. Select Backup and Restore => Backup to do so.

Step 7: Perform a full data wipe. Select Wipe Data/Factory Reset => Yes.

Step 8: You are now ready to install Slim Bean ROM: select Install zip from SD card => Choose zip from SD card and browse through the root directory of your device’s internal memory where you saved the packages. Look for Slim Bean ROM package. Wait for a few minutes for the installation to complete.

Step 9: You are now ready to install Google Apps: Install zip from SD card => Choose zip from SD card but this time choose Google apps package and wait for a minute or two.

Step 10: Now go back to recovery main menu and select Reboot System Now. It may take longer than usual for your device to boot up normally but you have to wait until it’s fully active before you use it.

Your ASUS Transformer is now running Android 4.2.1 via Slim Bean ROM. The development of this custom ROM is still underway that there could be more updates to be released soon.

Just in case you want to go back to your previous ROM, you just have to boot your device into recovery mode and select Backup and Restore => Restore and browse through your device’s internal memory and look for your previous ROM.

You can neither blame The Droid Guy nor developers behind this ROM for possible damages this tutorial may cause. It’s on you if you update your device or not, but you have to know it’s risky especially for people who don’t have sufficient knowledge in flashing custom ROMs.

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