Samsung SGH-I997 at&t Firmware or Tools required also with Guide how to flash

Download Firmware Here

Place phone in Download Mode (Remove battery, hold down both volume buttons, replace battery, attach USB cable, and then continue to hold volume buttons until the phone enters Download Mode.)

Download Odin

Run odin select the file in pda field flash it if hang on logo reset it after flash

To put recovery mode hold power button and both volume buttons, release power button when Samsung logo appears, continue to hold volume buttons until recovery screen appears