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What is legality of making alternative firmware for Tesla? I guess they could argue with safety. Does the car loose road worthy certification, if its software is altered?

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Can't comment on certifications but aftermarket performance upgrades that are not from Tesla already exist through hardware modification with some attempt at the "cat and mouse" game of detection and evasion one might expect from such activities. Haven't hard of any lawyers getting involved though.

I would assume if you do something dumb with the electronics or software you wold probably be found liable in terms of insurance.

Definitely needs to be a thing. idk if it has been on HN yet but there is a opengarages.org site that has a nice ebook if anyone is interested.

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