I’d assume the firmware is the same shipped with the vendor or pretty much very close to the sample code.

Does it require something like an API key or password? Can these implement diff Hellman key exchange? Otherwise I’d just assume you can eavesdrop when someone is updating the contents.

It would be a shame if your phone was infected by a malware that rewrites all the prices in the tags in your vicinity.

I need someone to explain the joke. Waiting 100,000 years for radioactive decay seems to be a bit boring as a punch line.