Hold the reset button for 3 seconds

The DFU app is for updating the firmware only. For now there are no updates. Yours was shipped with latest firmware. As for water proof, we will never...

We don't have a diagram. The Quantum is completely wireless. The Shifty or the BIT buttons plug into the BB hub. You can mount the BB hub externally o...

Yes you will need the hub.

Yes you need the hub to connect either BIT or Shifty buttons

Can you please post a picture of where it is broken? That will help us decide best strategy to remove. Normally you just remove the rubber cap under t...

Unfortunately we do not sell spare parts for the BIT. You will need to order a new one.

@andrewmoult That is very strange. Have you tried updating the firmware on the Blakbullet? Also do long button reset and see if that fixes it. And, be...

You need:QuantumBlakbullet hubBattery ChargerChoice of BIT or Shifty buttons, depending on your barDerailleur adapter. Check the cable port on your de...

@daisuke-eto The APP is not compatible with Android 10. You must upgrade to at least 11, and preferably 12. Especially with anything related to Blueto...

@daisuke-eto By the way, can you tell us what type of phone and OS you were using for the update?

@daisuke-eto Please note, the LED on the BB is very dim. Its hard to see. Please check again if its working. If not, don't charge it for 3 days and le...