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Bosch Kiox (BES2): update the firmware (display via app, drive unit via dealer)
The display updates itself over Bluetooth through eBike Connect; drive unit and battery updates still need a dealer with DiagnosticTool. Ten minutes for the display update.
Step by step
- Pair the Kiox with eBike Connect (see the app-pairing guide) and keep the bike switched on.
- When a display update is available the app shows a notification; tap it and start the update. Keep the phone next to the bike.
- The Kiox restarts when done. Check language, units and brightness afterwards; defaults may have returned.
- To see versions on the display: Settings > Info (or 'System info') shows Kiox, drive unit and battery versions.
- For drive unit or battery updates, or if the app reports 'update via dealer', book a Bosch dealer; they use DiagnosticTool over the diagnostic port.
Tip: Do the display update on a full phone battery and a bike that is switched on; an interrupted update can leave the Kiox on the boot screen until a dealer reflashes it.
Can't find it?
If the app never offers an update, you may already be current, or the phone's Bluetooth connection is unstable; try a different phone. If the Kiox is stuck on the Bosch logo after an update, only a dealer can recover it.
Frequently asked
Can I update the motor via the app?
No, only the Kiox display. Drive unit and battery firmware are dealer-only.
Does a display update erase my kilometres?
No; total distance is in the drive unit.
How long does it take?
Usually 5 to 15 minutes over Bluetooth.
Manuals and video
- Bosch eBike Help Center: official error-code index
- Bosch eBike downloads: quick start guides and battery guide
- Bosch eBike dealer search (DiagnosticTool readout)
Other Bosch Kiox (BES2) guides
Bosch Kiox (BES2): change the display languageBosch Kiox (BES2): switch from mph to km/h (or km/h to mph)Bosch Kiox (BES2): set the time and time formatBosch Kiox (BES2): reset the trip and set automatic trip resetBosch Kiox (BES2): wheel circumference (dealer-set, small correction possible)Bosch Kiox (BES2): change assist modes and what can be customisedBosch Kiox (BES2): activate and use eBike LockBosch Kiox (BES2): set the display brightnessBosch Kiox (BES2): pair with the eBike Connect app via BluetoothBosch Kiox (BES2): enable and use walk assistBosch Kiox (BES2): turn the lights on and off, always-on lights
Still stuck? Take a photo of the display and show it to a local e-bike workshop. Bring the bike's system name (e.g. Bosch Performance Line CX) and the exact code; that saves diagnostic time and money.