The TWRP recovery has been out for the AT&T Galaxy S3 officially that is necessary to apply hacks on a Android device, the TWRP recovery is more secure tool to install custom ROMs, MODs, make backup of ROM, wipe the device and more, not a while ago, TeamWin updated their TWRP recovery to the version 2.2, now you’re able to rename your backups using its on-screen customizable keyboard, you have option to save setting, install multi-.zip files at one time, confirm signature, apply themes and more, so if you love these features, be sure to take a look at our below step by step guide to install TWRP recovery on your AT&T Galaxy S3 SGH-I747.
Before installation, make sure that your Galaxy S3 is rooted, you can use all-in-toolkit to root the phone, or follow our this guide to root the phone. The GooManager app must be installed on phone, download from here or here, if you download APK file, install the app using File Expert app, just enable “Unknown Sources” from Settings > Security and start installation. Make a backup of your device data such as SMS, internet setting, contacts music files etc because the below procedure may wipe data, you can sync your contacts with Gmail account and for messages use SMS apps, lastly use file expert app to backup apps.
Step #1: Open GooManager app, it will ask for root access, allow it.
Step #2: Tap on menu button, or tap on a 3 dotted button that can be found at right corner.
Step #3: At list, tap on Install OpenRecovery Script, and select yes. Then confirm the action on next screen to start installation of recovery.
Once the installation is done, the device will reboot itself. That’s it, when you need to use TWRP recovery, simply, turn the phone off and reboot it by holding down volume up, home and power buttons. Do comment below for queries.