Is the Edge Explore 2 compatible with Shimano Deore Di2 without needing to install any app?
Is the Edge Explore 2 compatible with Shimano Deore Di2 without needing to install any app?
No, it doesn't. The applications work fairly well but don't allow the use of the D-Fly.
EE2 does not support Di2 out of the box, but there are a few developers that have created SmartIQ fields (or whatever Garmin calls it) compatible with Di2. I have one that displays gear position and battery status, it costs 5 EUR, and it works nicely. Just go to Garmin Connect on your phone and search for Di2 in the "app store".