AT&T makes it difficult by not releasing the firmware but I have used the zip files from XDA to fix and update several i747's. After you get the 3 zip files copied to the phone, boot into download mode and flash your favorite recovery again. Sometimes it's best to uncheck Auto Reboot in Odin and when you get a Pass, unplug phone,remove and replace battery, and then boot into hopefully CWM . Sometimes the stock recovery will overwrite it if you don't.