Download and install the appropriate version of the Heimdall suite for your machine’s OS.The preferred method of installing a custom recovery is through Download Mode – rooting the stock firmware is neither necessary nor required. Heimdall is a cross-platform, open-source tool for interfacing with Download mode on Samsung devices. Samsung devices come with a unique boot mode called “Download mode”, which is very similar to “Fastboot mode” on some devices with unlocked bootloaders. How to restore: If you want to return to previous OS on your SGS3, boot into recovery, select backup and restore then restore your previous ROM by selecting it from the list.Important: Please read through the instructions at least once before actually following them, so as to avoid any problems due to any missed steps! First boot takes a good 5 minutes so please be patient. Return back to main recovery menu and reboot your AT&T Samsung Galaxy S3 into the new custom ROM.From recovery menu, select install zip from sdcard followed by choose zip from sdcard. Locate the SlimKat Android 4.4.2 custom firmware and confirm the flashing process.Then go on to wipe cache partition and wipe dalvik cache. Wipe data task: from CWM recovery menu, select wipe data / factory reset and confirm the process.Perform a Nandroid backup of your current OS: Backup > backup and restore on ClockworkMod recovery.Boot it into recovery mode by pressing and holding Volume Up + Home + Power buttons together.Disconnect the USB cord and power off your Galaxy S3. Connect Galaxy S3 to your computer using a USB cable and copy the zip file to your phone’s SD card.Required files: download the SlimKat Android 4.4.2 KitKat custom firmware for Galaxy S3 I747 from here and save it on your computer. How to flash SlimKat Android 4.4.2 on Galaxy S3 I747: Note: this tutorial is focused on AT&T Samsung Galaxy S3 SGH-I747 kindly do not try this guide on other Android & Samsung devices.
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