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I have no idea what the architecture of these devices is like so I am willing to take your word for it. If what you are saying is true, then yes, it seems likely an original firmware build would avoid the AC prohibitions, and my initial opinion was in error.
I have no idea either, but practically every device of this sort is just a chain of one or more loaders and the final image. Once you take control at any step of the process, you can replace all running code with your own and not use anything else that may incidentally be there.
Also, nothing says they encrypt their firmware - if they don't, then there is no effective technological protection measure involved there either.
The server check is the TPM in this scenario, though as noted that requires a couple of steps I don’t know happen and your expertise says are unlikely to happen.
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