[gatmne]

Cars and planes (and even radio transmission equipment) pose a high risk on public safety. They aren't restricted because owners don't have the right to control these devices, they are restricted because public safety is at risk otherwise.

Processors don't fall into that class of devices. In fact, I'm willing to argue that not allowing owners to patch their devices is a public hazard (ddos botnets, mass identity theft, etc).

[prostoalex]

Is there a precedent of someone buying a closed-source product, suing for being unable to update it, winning the case in court and being awarded damages?

[gatmne]

Hopefully, this would be it. But rather than damages, the courts would rule that access to one's own device is protected by a fundamental right.