Load of rubbish ... Bluefin does it through the ODBC port.Exeo has Bosch 17 tricore ecu with "tuning protection". You have to use a special interface cable that attached to ecu, pinned on with special tool or soldered on. Then you use a bootloader program to access the ecu.
This is nothing you do in your garage, but at your tuner. They saves the original map, and can always put it back. (usualy for money)