1. Download Odin v3.13.1
  2. Extract the firmware file you just downloaded. You should get 5 files:

    AP (System &Recovery)

    BL (Bootloader)

    CP (Modem / Radio)

    CSC_*** (Country / Region / Operator)

    HOME_CSC_*** (Country / Region / Operator)

  3. Add each file to it's respective field in Odin v3.13.1. Use CSC_*** if you want to do a clean flash or HOME_CSC_*** if you want to keep your apps and data.
  4. Reboot your phone in Download / Odin mode with the following button combo: POWER + VOLUME DOWN + BIXBY

    Other options in case first option did not work or isn't possible.

    Option 2 VOLUME DOWN + VOLUME UP than USB cable

    Option 3 POWER + VOLUME DOWN + VOLUME UP

    Option 4 POWER + VOLUME DOWN + HOME BUTTON

  5. Once in download mode, connect your phone to the PC, preferably using the original USB cable you got with your phone. Odin should detect your device and a BLUE box will show up with the COM port number. (Be sure, the SAMSUNG-drivers are installed on your PC!)
  6. Do NOT tick any extra boxes. The only options to be ticked are F.Reset Time and Auto-Reboot.
  7. Click the start button, wait for Odin to say 'PASS' in a GREEN box. Once the flash is complete, your phone will reboot, and you can disconnect your phone from the PC.