Heed the warnings you read here, fellow Di2ers. – E-TUBE PROJECT Cyclist Review

First day with my bike, and I had the EW-WU111 ready to go. Everything was working fine until I opened this app, then my system was bricked. I managed to restore it all, tried again, and bricked. Don’t bother with this horrible software. If you do end up shutting down your entire Di2 system, unplug each of the cables from the junction box, and disconnect the junction box from the battery. I also had to unplug the Di2 wires at the derailleurs. Plug everything back in and you should be good to go.
Review by Ph0re on E-TUBE PROJECT Cyclist.