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D-Fly and Edge 520 Won't Connect After DI2 Firmware Update

Former Member
Former Member over 8 years ago
End of 2016 I updated the firmware for DI2. Now, I cannot get the D-Fly sensor and my 520 to connect. I have "woken up" the DI2 system prior to turning on the Garmin, by shifting a few times. I've disabled/re-enabled the D-Fly sensor (on the Garmin) - no luck. I've removed the D-Fly sensor from the 520, and tried to re-add it. No luck - can't be found.

Any ideas? D-Fly and Edge 520 talked nicely to each other up until DI2 firmware update.
  • 0 over 8 years ago
    One thing to try is to disconnect and reconnect the Di2 battery from the rest of the wiring.
  • Former Member
    0 Former Member over 8 years ago
    D-Fly and Edge 520 Won't Connect After DI2 Firmware Update

    You asked:

    Where is D-Fly mounted?

    It is on the back part of the frame, about 6 inches from the hub.

    I can try disconnect/re-connect the DI2 battery. How are you thinking that will help - just curious.
  • 0 over 8 years ago
    Removing the power source from the components causes them to reset. As the D-Fly is not in the bike frame you can do that by just disconnecting the D-fly. Wait 30 seconds or so and then reconnect it. Do you have the Di2 cable tool for disconnecting and reconnecting cables.
  • Former Member
    0 Former Member over 8 years ago
    D-Fly and Edge 520 Won't Connect After DI2 Firmware Update

    I do not have the DI2 tool you mentioned. Is that necessary to disconnect/connect the D-Fly?
  • 0 over 8 years ago
    I would not want you to damage the cable trying this. Have a look at the tool online. It is quite simple. It has a small open half circle at one end that fits on the cable connector to pull it out. The other end is used to push the connector in.
  • Former Member
    0 Former Member over 8 years ago
    D-Fly and Edge 520 Won't Connect After DI2 Firmware Update

    Your suggestion worked of disconnect D-fly, wait 30 seconds, reconnect D-fly.

    Thanks. Back in business with D-Fly.
  • Former Member
    0 Former Member over 8 years ago
    D-Fly and Edge 520 Won't Connect After DI2 Firmware Update

    Spoke too soon.

    The Dfly and Garmin definitely DO connect after disconnect Dfly from power/wait 30 seconds/reconnect Dfly. This works fine.

    However, after turning off the Garmin... wait at least 20 minutes... turn the Garmin back on (and of course "wake up" DI2 before then) - same behavior. That is, Garmin does not recognize Dfly.

    The only thing I have changed is updated firmware on the DI2. Is it possible Garmin is not compatible with the updated version?

    Thanks.
  • 0 over 8 years ago
    Something else must be going on.

    The latest software update for the D-Fly was made in September 2016 (Build 3.0.6) so there are lots of people using that build, including me.

    Check that the data cable connection to the D-Fly is correctly connected. If it is then it sounds like the Edge is not retaining the sensor details correctly. You may have to do a reset of the Edge and repair the units.

    I would check that the cable is fully inserted and if it is then post the settings.fit file and I will take look at that to see if anything looks wrong.
  • Former Member
    0 Former Member over 8 years ago
    D-Fly and Edge 520 Won't Connect After DI2 Firmware Update

    Where does the settings.fit file come from, and I will send it to you.

    BTW, I (again) disconnected/waited 30 seconds/reconnected the Dfly, just to verify I could duplicate the problem. Same behavior - connects immediately to the Garmin, but second time I turn on Garmin, dfly is not recognized.