The locks in question pair over short distances - by design - and generally have to be taken off of the door and held need the controller to pair. Having an outsider cause a downgrade attack at that one critical time would be extremely unlikely. Once paired, there is no path to attack.
Sure, I would have locks reflashed if the manufacturer offered it inexpensively. But there's no reason to panic.
A sonic attack from space may sound far-fetched but they have been doing very creative things with lasers and microwaves these days.
Obviously there isn't going to be a sonic attack from someplace with no atmosphere.
Lasers actually do spread, one from space is going to end up being larger than someone's house, and easy enough to detect. Microwaves will never get that narrow a beamwidth and are easy to receive.
Tell that to the Dutch. Then duck!
While the economic and military weight of those large nations is obvious, the Dutch are nobody's puppets. Just spend some time there. And especially today, when they (and most Europeans) find Trump possibly more repulsive than Putin.
Sorry about your acquaintances. But my comment meant that the Dutch didn't have a reason to blame the Russians if they didn't think the Russians were responsible.
One would think that the homes of diplomatic workers are as well monitored for sound, RF, and radiation attacks as the office building.
Say you have two ultrasonic alarms working at 31 KHz and 36 kHz. The difference frequency is 5 kHz and is most likely to be heard between them rather than close to them. Nontechnical people would have no understanding of this phenomenon.
Well, the Dutch don't have a horse in this race. I'd much rather trust them than an Anonymous Coward.
A consultant is a person who borrows your watch, tells you what time it is, pockets the watch, and sends you a bill for it.