: The piezo sensor, which counts particles, doesn't require a software update but does benefit from keeping the bin and intake clear of blockages.
Without regular updates, your $700+ vacuum will eventually underperform or fail to recognize new accessories.
After reboot, go to Settings > About on the vacuum. The firmware version number should have changed. The app will also confirm the update is complete.
Since the context isn't fully specified, I have created a few variations of the post depending on where you intend to share it (e.g., a tech forum, a social media channel, or a blog update).
Heads up, Dyson V15 owners! A new firmware update is rolling out. If you haven't checked the Dyson app recently, now is the time.