Re: Let's get physical
Very cheap, yes. But surely subject to the same security concerns as a software update: an imposter could brew up a ROM containing malware, at a cost that's a drop in the ocean compared to a home or car system. Security again boils down to a cryptographic chain of trust.
How do SIM cards authenticate? That looks like a framework for pushing out a handshake. Having a SIM card manage security of signed updates, whether of hardware or software, should surely be feasible.