The Di2 Wireless unit and MT800/M9051 displays are great – they both allow the user to connect to the Di2 system wirelessly using Bluetooth LE to view all kinds of data. They will also let you set up synchro-shift using your mobile apps (provided you’ve got the synchro-enabled batteries).
In order to connect to these units using your mobile phone you will need to press-and-hold the junction box button for about 2 seconds and then enter a passkey in the app. The default passkey is “000000”, but as Shane Miller/GPLama pointed out in this video, it is a good idea to change this – just like you would change the default password on your router or any other things-you-want-to-keep-secure. This is how it’s done.
Using the mobile app to update firmware is not something we recommend, but it works just fine for changing settings or viewing system information. Download either one of the Android or iPhone mobile/tablet apps, make sure Bluetooth is enabled and start the app.
- Tap the “Bluetooth LE connection” button after the app has loaded
- Hold the button on your junction box for 2 seconds and let go
- Your Wireless unit will now accept Bluetooth connections
- Once the app displays your device (EWWU111 in the image above), tap the device name to connect to it. (you may have to enter a passkey)
Once you have established a connection tap the menu icon in the top right and select the “Bluetooth LE settings“ button. You will now see something like the image to the right.
This is where you can change the name of your device and change the passkey.
Simply enter your new passkey twice and tap the check mark button to save it – done!
Once you have connected your bike click the “Bluetooth LE settings” button to open the settings page.
Just like in the mobile app, this page lets you change your device name and change the passkey. To change the passkey, enter a new key twice and click “set“. You can also reset the passkey to its initial value (000000) by checking the “PassKey initialization” box.