The first step is to switch to download mode. Press simultaneously Volume Down, Home, and Power, and wait for download mode.
Then, you can simply connect the phone to Windows computer, start Kies, and select Update Firmware.
Or, you can flush whatever you want through Odin, includung TWRP.
Then, you can simply connect the phone to Windows computer, start Kies, and select Update Firmware.
Or, you can flush whatever you want through Odin, includung TWRP.