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. 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 PAC-MAN Android 5.1 Lollipop 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 PacMan Android 5.1 Lollipop custom firmware for Galaxy S3 I747 from here and save it on your computer. If in case anything goes wrong or if you have any queries, feel free to ask in the comments below.How to update Galaxy S3 I747 to Android 5.1 PAC-MAN: We hope that this guide is helpful to you and you have successfully installed the Lineage OS 17.1 on your Samsung Galaxy S3 handset easily. Wait for it, as the boot process will take a few minutes. Finally, reboot your phone into a new system. 
The system will be mounted already Uncheck it & Remount system and vendor manually. Flash the ROM zip file from the Install option. If you did this correctly, the next time you press Power, your device will go directly to your homescreen. Immediately after hitting Home, press the Power button. When in the Emergency Contact screen, hit the Home button. Select the Emergency Contact icon on the bottom left. 
Select Advanced Wipe > Select the data, system, vendor, cache. Lock your phone and turn the screen back on. Download TWRP Recovery for S3 SGH-I747 AT & T :- Click Here to Download. In recovery menu, tap on Install button > Install Image > Select the TWRP Image file from the location where you have moved earlier. Pre-Requisites to Installing CWM Recovery your Android device. Next, reboot your Samsung Galaxy S3 into recovery mode. Now, copy the TWRP image file, GApps file, and ROM zip file to your device internal storage. Make sure that you have downloaded all the required files on your device. Instructions to install TWRP Recovery on Samsung Galaxy S3. Download and install Samsung USB Drivers.
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