Tips & Tutorials

Install ZSUBNB1 Android 4.3 on Galaxy S3 I9300 Stock Firmware

ZSUBNB1 Android 4.3 firmware update has just been released for the Samsung Galaxy S3 I9300 in Hong Kong region. This firmware is based around Android 4.3 Jelly Bean and is here to address the bugs without any major update. Samsung is following up the Android 4.3 update for the Galaxy S3 I9300 very well, with almost a new build every week which fixes errors and bugs that are found in the software update. You should note that I9300ZSUBNB1 is a official firmware and not a custom ROM hence we wont be using any custom recovery. You can easily update Galaxy S3 I9300 to ZSUBNB1 Android 4.3 official firmware and also root this firmware! For those interested, you can now also install Android 4.4.2 KitKat on Galaxy S3 or a custom ROM based on this firmware!

As we continue below, we will guide you through every step on how to install ZSUBNB1 Android 4.3 Jelly Bean on Galaxy S3 I9300 using ODIN, which is the flash tool used in this and every Samsung mobile update guide, and also showing you how to backup your important data. Don’t forget to backup all your apps and personal data to assure safety. It would be in your favour if you check your backup once again. Let’s continue with the tutorial now.

Samsung Galaxy S3 I9300 - ZSUBNB1 Android 4.3

Disclaimer: All the custom ROMs and firmwares, official software updates, tools, mods or anything mentioned in the tutorial belong to their respective owners/developers. We (TeamAndroid.com) or the developers are not to be held responsible if you damage or brick your device. We don’t have you on gun point to try out this tutorial 😉

Android 4.3 ZSUBNB1 Firmware Details:

Model: GT-I9300
Model name: GALAXY S III
Country: Hong Kong
Version: Android 4.3
Changelist: 2413962
Build date: Wed, 26 Feb 2014 05:39:59 +0000
Product Code: TGY
PDA: I9300ZSUBNB1
CSC: I9300OZSBNB1
MODEM: I9300XXUGNA8

Android 4.4.2 ROM: For those interested, you can now also install Android 4.4.2 KitKat ROM on the Samsung Galaxy S3 I9300. Read the tutorial here!

Previous Jelly Bean official firmware tutorials for Galaxy S III:

Samsung Galaxy S3 USB Drivers

You will need to connect your Android phone with the computer. For that, please make sure you have installed the USB drivers for Samsung Galaxy S3 properly. If not, you can download the latest official drivers from our Android USB Drivers section here:

Download Samsung Galaxy S3 USB drivers!

Backup and Other Important Tips

Done with the USB drivers? Perfect. The tutorial is on the next page, but first, please take a look at the following tips and important points you need to take care of. These are important, as we don’t want anyone losing their personal data or apps:

Always backup your important data that you might need after you install a new custom ROM, an official software update or anything else. Make a backup for just in case, you never know when anything might go wrong. See below for some tips on how to backup data:

Samsung users can also back up data using Samsung KIES. If you backup data manually, you get more options what to choose from and it is very easy to move data across Android devices from different manufacturers, i.e moving Samsung Galaxy Note backup data to HTC One X.

If you already have a custom recovery (ClockworkMod, TWRP etc.) installed on your phone, we strongly recommend a backup using that as it creates a complete image of your existing phone set up.

A few more optional tips that you should remember:

1. Having problems connecting your Android phone to the computer? You need to enable USB debugging mode. See here: How to Enable USB Debugging — for Gingerbread, Ice Cream Sandwich and Jelly Bean.

2. Make sure your Android device is charged up to 80-85% battery level. This might help you: How to Check Battery Percentage. Why? Because, if your phone goes off suddenly while installing a custom ROM, flashing an official firmware update or installing mods etc. — your phone might get bricked or go dead permanently. No one wants that, right?

4. Most of the tutorials and how-to guides on Team Android are for factory unlocked Android phones and tablets. We recommend NOT to try our guides if your phone is locked to a carrier, unless we have specified the carrier name or device model.

If you find the above tips useful and they were helpful to you, please consider giving us a +1 or LIKE to thank us!

All set and ready? Good. You can now head over to the next page and update Galaxy S3 I9300 to Android 4.3 ZSUBNB1 official firmware update.

About the author

Taimur Akmal

Devoted writer, enjoys developing code. Appreciates excellent food, exceptional coffee and great company. He is also into sublime design and nicely built cars.

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