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Update AT&T Optimus G to Android 4.4 KitKat OS with SlimKat Custom ROM

Do you want to try the Android 4.4 KitKat firmware on your AT&T LG Opimus G ahead of OTA release? If so, you will have to apply a custom ROM software; now this tutorial will show you the exact thing: how to update AT&T LG Optimus G to Android 4.4 KitKat OS with the new SlimKat custom ROM. If you want to learn more aspects about this platform and if you want to flash the same on your smartphone, then don’t hesitate and check out the guidelines from below.

The best is that this custom version of Android 4.4 is stable as those of xda-developers (we should thanks them for this step by step guide) had managed to bring a smooth port of the stock KitKat firmware. According to those who have installed the SlimKat system on their Optimus G handsets, there are problems only with the external SD card which isn’t recognized by the OS. Anyway, don’t worry as this problem will soon be resolved by the devs and you will receive a suitable update when that happens.

Besides that, everything else is working perfectly, so you will be enjoying a stable and bug free Android 4.4 KitKat software on your AT&T LG Optimus G. Because of that, we will be checking on how to flash this custom ROM on your smartphone. The update operation is not hard to complete, though before heading to the proper steps you do have to check the pre requisites list. Therefore, let’s see how you can prepare your device for the installation procedure that will shortly follow.

First, it should be clear for you that the SlimKat system represents an unofficial port of stock Android 4.4 KitKat OS. Therefore you are not dealing with an official Android update released by LG or by AT&T for your Optimus G. That’s why, the software can be installed only manually and only by using the guidelines from this dedicated tutorial. Do consider this operation risky and complex and try not to mess things up as you can even end up in bricking your Android based device.

Now, the first thing to do before flashing the Android 4.4 based OS on your AT&T Optimus G is to gain root access. You need to root your handset if you want to enjoy the latest features, apps and capabilities along with extra features and looks that are available on the Android system, so this is not an option for you. Unfortunately when doing so, the warranty will get void. Why? Well, because when rooting the binary flash counter will be increased. As a conclusion, for restoring the warranty you will have to reset the flash counter, and this can be done only by downgrading / updating to stock / official Android firmware.

As soon as the Optimus G is rooted, you need to replace its stock recovery image with a custom one. I recommend you to use the latest version of CWM or TWRP recovery, as the SlimKat custom ROM has been tested on the AT&T LG Optimus G only by using the mentioned custom recovery images. Don’t worry as CWM recovery is the most popular custom recovery used by worldwide Android users while TWRP recovery is the touch version of the same. Anyway, install the tool only after gaining root access.

Then, backup the Optimus G data. We all know what kind of info you can store on a smartphone, so because of that it should be more than indicated to make sure that your personal info and accounts are in safe hands. During the flashing process a wipe will have to be applied and when that happens, everything that is saved on the internal storage memory will be erased or will get corrupted. Remember to save the current ROM too, as maybe you will not like the new Android 4.4 KitKat system on your Optimus G – if a Nandroid backup is being performed you can easily return to stock Android OS.

When completing a manual update operation you should know that there are some operations that will always be required. These operations are the following ones: on the computer you will use (you need to have access to a computer or notebook, to your smartphone and to its USB cable) you need to disable the antivirus programs; then on your Optimus G you have to check the USB debugging option which can be enabled from “menu -> settings -> developer options”; also, the battery status should display more than 60% power – else you have to charge your device before going any further. It’s important to apply this guide only for the AT&T version of the LG Optimus G because the steps from below are compatible only with the mentioned handset.

How to Update AT&T Optimus G to Android 4.4 KitKat OS with SlimKat Custom ROM Firmware

  1. First of all, go here and download the update file on your computer.
  2. Don’t unzip the file, just place it on desktop.
  3. Similar, do the same for getting the Google Apps package (you can download the package from here).
  4. Since the Google apps are not included on the SlimKat system you will have to install the same separately on your Optimus G.
  5. Now, by using your phone’s USB cable connect the computer with your smartphone.
  6. Next, select the downloaded files from desktop and transfer the same on your phone’s SD card
  7. Remove the USB cord as the computer is no longer useful for us.
  8. Turn off your Optimus G.
  9. Wait a few seconds before heading to the next steps.
  10. Use this guide and learn how to reboot in recovery mode.
  11. From recovery the first thing to do is to wipe the data and clear the cache.
  12. Wipe the system by selecting “wipe data factory reset”.
  13. Then clear the cache by choosing “wipe cache partition”, return and select “advanced” followed by “wipe dalvick cache”.
  14. Return to main menu of recovery by choosing “+++go back+++”.
  15. Then select “install zip from SD card” followed by “choose zip from SD card”.
  16. Pick the Android 4.4 KitKat firmware; flash the custom ROM on your AT&T LG Optimus G.
  17. Then, similar as explained above select “install zip from SD card” and “choose zip from sd card” for flashing the Google Apps package on your device.
  18. In the end, return and select “reboot system now”.

There you have it; that was all for now, as you have successfully learned how to update your AT&T LG Optimus G to Android 4.4 KitKat firmware. So, now your device is running on the SlimKat custom ROM; because of that you should test the new OS. If there are bugs or issues, or if you just want to share your experience with us and with other users who might want to complete this step by step guide, use the comments area from below and talk with us.