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Subaru probably made the assumption that the car has an aftermarket ECU flash if the emission control variables are all undefined / zero when trying to start the car, as the aftermarket ECU tends to have an infinite loop in place to not let the routine finish initialization in order to keep the check engine light off.
The BRZ has a Toyota ECU which requires a Techstream laptop to work on it, I don't think the traditional Subaru diag stuff would work.
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