Change your Di2 Wireless Passkey using the E-Tube mobile 4.0 or Windows PC

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.

E-Tube Project Mobile App

Using the mobile app to update firmware used to be a bit tricky.. the app was prone to crashes and used to "brick" bikes. However, it has gotten much better when Shimano updated it September 1st 2020. Let's have a look at how to change your passkey using E-Tube Project 4.0.

Download either one of the Android or iPhone mobile/tablet apps, make sure Bluetooth is enabled and start the app.

Change wireless passkey Bike overview

  • Start up the app and log in if you haven't already. You should now see your bike profiles
  • Hold the button on your junction box for about 2 seconds and let go. If you're using a display it'll now show 'C' and the LEDs on regular road junctions should flash red and green.
  • Your Wireless unit or display will now accept Bluetooth connections
  • Once the app detects your device ("Searching" changes to "Detected"), tap the bike profile to continue.

Once you have established a connection you'll see the list of components installed on the bike. Scroll down to find your Wireless device (EW-WU111 / EW-WU101 / SC-MT800 / SC-M9051).

This is where you can change the name of your device and change the passkey. Near the end of the page you'll find the 'Change' button. Simply tap that and enter your new passkey.

Change wireless passkey

If you're happy with the configuration all you need to do is tap the 'Apply' button and the bottom and the settings will be saved to the file. Want to restore the default settings? Then tap the icon at the top right.

Change wireless passkey Featured Changed passkey

When you're done in the mobile app don't forget to 'disconnect' the app by using the button on the main screen. If you don't, the bike will remain connected and not respond to shifts.

Windows computer

The process is similar to that of the mobile apps. Make sure you have the e-Tube software downloaded and installed and connect your bike to your computer or laptop.

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Once you have connected your bike click the “Bluetooth LE settings” button to open the settings page.

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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.

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Once you click ‘set‘ the app will show you the changes it did. Now you’re all done!

Connection failed? App spins and gives up?

In some cases the mobile app won't even ask you for a wireless passkey. It will just try to connect, show the 'spinner' and then give up eventually. Almost every time this can be fixed by going to your phone's Bluetooth device list and forgetting the EW-WU111. Then relaunch the mobile app and try again.

Still not having any luck? Just send me an email!