Automatic checksums

All checksums are calculated automatically by bFlash before programming, you should not calculate the checksum yourself. Depending on the ECU type, bFlash might also correct the CVN (Calibration Verification Number) , the Flash Counter and/or Flash Date&Time so the programming leaves no trace. Please consult the "Help guide" in the bFlash software for a specific car model to see if the CVN or Flash Counter are fixed or not.