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Flash SlimKat Beta Android 4.4.2 Weekly ROM for Samsung Galaxy S3 I9300

SlimKat beta is now live for the Galaxy S3 I9300. Use this guide if you want to learn how to successfully install it on your device.

SlimKat is a smaller version of a custom ROM, as it doesn’t incorporate all features that you usually find in CM, Paranoid Android or other big custom KitKat ROMs. It is destined to be used by those Galaxy S3 users who want their phone to run as smooth as possible.

It is not an official Samsung update, but it is based on AOSP KitKat and it packs some of its own functions. It currently has reached the Weekly or Nightly builds, this means that it cannot be used as a stable build and you should only use it for testing a pure KitKat experience.

This is a custom ROM that is based on AOSP Android 4.4.2 KitKat and on other similar custom ROMs such as CyanogenMod, AOKP and Paranoid Android. More info about this release can be found at this XDA thread here.

Before starting the installation you will have to take a look at the preparation guide below:

  • Use this tutorial only with the Samsung Galaxy S3 model number I9300.
    – do not attempt to install the ROM that you will find in ┬áthis post on any other Android device.
  • Your device has to be rooted and running the latest CWM Recovery image.
    – TWRP Recovery will also work with this guide.
    – whichever custom Recovery you decide to use make sure that it is updated to its latest version.
  • It is recommended for you to create a full NANDROID Backup of the installed ROM:
    – this step is listed in the tutorial and you shouldn’t skip it, as it sets a restore point for your phone.
  • Factory Reset is required for your phone.
    – this step is shown in the tutorial, so you shouldn’t skip it.
    – factory reset will delete all data from the system partition, while the internal / external storage won’t be affected by this tutorial.
  • Backup data from installed applications and SMS text messages using Helium tool for Android here.
  • Sync Contacts info with your default Gmail account.
    – guide here for those of you who don’t know how to do it.
  • Enable USB Debugging from Developer Options menu.
  • Check the phone’s battery charge level and make sure that it is over 50%, this will prevent the smartphone from switching off in the middle of the installation.
  • This is a guide for advanced users, do not skip any steps and don’t blame us in case something goes wrong leading to a bricked device or losing any type of data files.
  • Read the entire tutorial before starting the installation.
  • If you cannot complete the guide, then you can always choose to ask for extra help in comments.

Since you’ve read all of the above you can continue to the next part of this post and learn how to successfully update your Galaxy S3 with a custom KitKat ROM.

How to flash SlimKat Android 4.4.2 Weekly builds for Galaxy S3 I9300:

  1. Download the custom ROM latest build from here.
    – make sure to download the latest build available.
  2. Download Gapps for this ROM from here.
    – get the SLIM AIO build.
  3. Connect your smartphone to your PC and then copy both zip files to your device’s internal storage.
    > don’t unzip the contents of the archives.
    – Disconnect the phone from computer when the files are copied successfully.
  4. Power off your smartphone now and then boot the Galaxy S3 in CWM Recovery Mode.
    > if you don’t know how to do it, then you can find more info here.
    – TWRP Recovery will also work with this post, but you have to select the corresponding options.
  5. When you’re at the main custom Recovery screen you can start by creating the NANDROID Backup of your currently installed ROM:
    – select ‘backup and restore’, name the file and confirm process.
  6. Now you can apply the Factory Reset for your device:
    – select ‘wipe data/ factory reset’ and confirm.
  7. Next, install the new custom SlimKat Android 4.4.2 ROM for your Galaxy S3:
    – select ‘install zip from sdcard’, then ‘choose zip from sdcard’.
    > find the custom ROM zip and confirm its installation.
  8. When the new ROM has been successfully flashed you can select once again ‘choose zip from sdcard’. Flash the Gapps zip.
  9. After all files are installed, return to the main custom Recovery screen.
  10. Reboot your phone now and wait for it to complete the first boot process.
    – note that the first boot process will take a while to load all the new files.
  11. Enter your Google Account details in order to gain control over your smartphone.

These were all the steps that you had to take in order to successfully update your Galaxy S3 to Android 4.4.2 via SlimKat ROM.

NOTE: if the first boot process doesn’t complete or the device enters into a boot loop, then you will have to repeat the entire post more than once. Make sure that in case you repeat the guide, then you will need to make sure that you won’t skip any steps that I’ve listed above.

make sure to apply the ‘format system’ option and additionally you need to use the ‘format /system’ option.

I hope that you did manage to update your device and that you’re now testing all of its brand new options.

If you don’t like this new ROM then you should restore the previously installed OS, the backup file created in step 5. For any other questions you should try to use the comments field below.

Samsung Galaxy S3 Articles