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@Suiseiseki@freesoftwareextremist.com Of course free software would be preferable but as I said and you explained in more detail. It is not updateable without some serious hacking and the manufacturer doesn't offer updates either. It is indeed practically equivalent to a circuit.

It also is not malicious whatsoever, all it does is read sensor data to control fuel intake, switch on the radiator fan when things get too hot, and uuh that's almost about it really.

Of course I could always replace it with something like a Speeduino which runs free firmware. The only issue with Speeduino is that the software used to program the ECU from a PC, called Tuner Studio is nonfree.