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Possibly pacemaker firmware? I have no real knowledge of the subject, but I'm guessing it'd be kind of risky to equip a pacemaker with Bluetooth to accept over-the-air firmware updates.

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You'd probably be right about the risk. But a buddy of mine has a pacemaker, and the version he has now allows wireless updates and tuning. It's possible that a firmware update still requires direct access, but it's possible it's wireless.

Of course, you'd better be darn sure the update works (firmware updates always scare me a little, never mind on a pacemaker!)

There were headlines in 2012 about pacemaker vulnerabilities. Apparently, they could be commanded to deliver an 830 volt shock, probably fatal, by someone with a laptop nearby.

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