E37, E38, E67, E78, E83, E92 (and more) ECMs, are dual core processors. One of the cores is readable and writable - this contains the operating system and most of the calibration. The other core is write only - it cannot be read. It contains the throttle controller. As this core cannot be read - it is not accessible by any tuning software.
To fully program one of these ECMs requires the use of GM software (SPS / TIS), and is programmed via the OBDII (DLC) port.
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