How to recover from a failed Di2 Wireless firmware update

The EW-WU111 Wireless Unit is a great piece of kit. It allows you to view Di2 information on your head unit, let your Di2 system control your head unit and lets you change settings and update firmware using the mobile app.

This last part is the tricky bit. While Shimano’s hardware is top-notch, the mobile apps tend to crash while updating your Di2 firmware, resulting in a non-responsive system. Part of this is due to the nature of wireless firmware updates, but it would have been nice of Shimano to show at least some recovery instructions.

Of course you could just decide to never use the mobile apps and not take any risks – but once you get the apps running they are actually pretty nice. Originally the only way to update the EW-WU111 firmware was using the mobile app, causing a lot of crashed systems… At some point Shimano started shipping the EW-WU111 with updated firmware, allowing you to update it using the SM-BCR2 charger.

If you're lucky you have one of the more recent models. If you're unlucky.. you'll have to do the initial update and setup using the mobile app. Don't worry though, recovery is usually easy!

This is what the update failure looks like..

How to perform the initial update as safe as possible

There are a couple of things you can do to reduce the risk of the update crashing on you. Here they are:

  • Make sure all other components are up to date by connecting the bike to e-Tube project (using the charger) and updating them
  • If the e-Tube Mobile app asks you to change the passkey, try to avoid do this. You can click the 'X' or 'cancel' and it should keep the default '000000'. Note that it is recommended to change the default passkey later, after the initial update has succeeded.
  • If you have already changed the passkey, disconnect the e-Tube mobile app and then go to your phone's bluetooth settings. Forget the EW-WU111 / 101 from the known bluetooth device list. If you don't there is a chance the phone cached the old wireless passkey and fails to reconnect halfway through the firmware update process, causing it to fail.

Update failed, bricked your system?

If the mobile app crashes or interrupts its own update-process chances are pretty good it has rendered your system unresponsive, leaving you unable to connect to it via the app or pc and often unable to shift as well.

Shimano’s official fix involves connecting the SM-PCE1 / SM-PCE02 diagnostic units to the crashed component and restoring functionality that way. Since this tool is rather expensive most consumers won’t have this and will be forced to bring their bike to the local bike shop. However, there often is another way to fix your Di2 system.

Restore Di2 system using SM-BCR2 Charger

Yep! The device you use to charge your Di2 system also doubles as a PC linkage device. You can use it to change or back-up settings and also update the firmware for each of your components. This last bit of functionality is what we’ll use to restore your Di2. Just do the following:

  • Disconnect the battery
  • Wait for 30-60 seconds
  • Reconnect the battery
  • Use the SM-BCR2/Charger to connect your bike to your computer via USB
  • Use the e-Tube software to restore the firmware on any confused or crashed components.
  • That’s it! You should now be able to use your bike again! Good luck updating the firmware and Ride On!