I... Please stop arguing against a step which could have been taken as part of a valid security model... I'm not saying this would have magically fixed the ch

I... Please stop arguing against a step which could have been taken as part of a valid security model... I'm not saying this would have magically fixed the chip firmware. I'm not saying this would have magically stopped anyone ever getting into the device. I'm not saying this would stop Google accidentally shipping an unprovisioned unit. I am saying a small move that strengthens the whole unit should be strongly considered. I'm sorry that backtracking from such a flippant response is so difficult for you. Frankly it's a custom chip design, they could burn an efuse to cripple UART in production consumer units, that has the same effect for 99.99% of chips that would sell.