In this tutorial, we will tell you how to install VanirAOSP Android 4.4.3 KitKat ROM on T-Mobile Galaxy S3 SGH-T999 with complete steps using CWM recovery. We also have several tips on how to backup your phone data and also some more tips that you have to keep in mind before proceeding to the tutorial on the next page. You will have to wipe your previous personal data and apps as usual when installing custom ROMs. The following tips are important as they will help the installation procedure to go smooth without any issues. Let’s begin with the tutorial below.
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 
VanirAOSP Android 4.4.3 KitKat ROM Details:
This amazing VanirAOSP custom ROM comes with tons of new features and is based on Android 4.4.3 KitKat. There are tons of useful articles and how-to guides on Team Android for the Samsung T-Mobile Galaxy S3, but we think you might be interested in the following posts:
- Install ClockworkMod Recovery: How to Install ClockworkMod Recovery on T-Mobile Galaxy S3 SGH-T999.
- Android 4.2.2 Custom ROMs: For a complete collection of T-Mobile Galaxy S3 SGH-T999 custom ROMs, click here!
Like this VanirAOSP ROM based on the latest Android 4.4.3? We love it too and we know you are looking forward to install it on your phone now. Now please read below for important tips on how to make sure your installation goes smooth and you do not end up with any problems.
Samsung T-Mobile 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:
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:
- Backup your Apps. How? –> How to Backup Android Apps.
- Backup your SMS messages. How? –> How to Backup/Restore SMS Messages.
- Backup Contacts, Gmail and Google Data. How? –> Sync with Google Sync.
- Backup Call History. How? –> How to Backup Call History.
- Backup WhatsApp Messages. How? –> How to Backup/Restore WhatsApp Messages.
- Backup APN Settings: GPRS, 3G, MMS Settings. How? Note down everything from: Settings > Wireless & Networks (More…) > Mobile networks > Access Point Names.
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 tablet, we strongly recommend you to also backup using that as it creates a complete image of your existing tablet set up.
