For more information on the Bosch M797 pinout and ECU-related topics, we recommend:
To put the ECU into "Boot Mode" for reading or writing the firmware via a programmer (like Galletto or Kess), you typically need to access the internal circuit board. Open the ECU: Carefully remove the metal casing. Locate the Boot Pin: Look for the (or similar) processor. Grounding: bosch m797 pinout better