In the past, vacuum cleaners were purely mechanical devices. If the motor spun, it worked. The Dyson V15, however, relies heavily on its internal computer. It uses a piezo sensor to count dust particles 15,000 times a second and adjusts the motor speed accordingly.
v2.3.1 (example) Release date: [Insert date] Dyson V15 Firmware Update
Tap "Update." The app will download the file to your phone first, then push it to the vacuum via Bluetooth/Wi-Fi. This takes about 1-2 minutes. In the past, vacuum cleaners were purely mechanical devices