FW 26.xx can't connect BT sensor

franz134
2 months ago

I have just switched to outdoor cycling and recently got FW 26.18 on my 840 (non-solar)

Since switching from 25.25 to the current version I couldn't connect my heartrate sensor anymore.
It's a bit of an older model with Bluetooth only, but it always was reliable.

I see the device in the available list, but then get the error "connection failed" (or german: Kopplung fehlgeschlagen)

I had FW issue with this sensor back during the 21.xx beta and my problem got solved with version 21.17
The changelog of this version said "Fixed connection issues with BLE sensors that do not support secure connections" -  so maybe it's similar topic

Would like to see a fast update. Thanks

  • 0 2 months ago

    I had access to a Venu 3 (FW13.17, also new around 2 weeks ago) and a Venu 2 (FW19.05 long time no updates):

    On the Venu 3 same problem as 840, the HRM was found, but when connecting "connection failed"
    On Venu 2 I could connect and read out some information:

    Indeed its BLE and from some research of the model number I found some test results of a lab, specifying "F1D, 2402 - 2480 MHz (40 ch), 3.0 mW/MHz", and Bluetooth Smart
    Idk if this might help a Garmin engineer 

    Or is it somehow possible to downgrade/rollback to a previous FW?

  • 0 1 month ago

    Has this issue been addressed in the current beta 27.07? Is there already a fix for?
    Maybe "Fixed issue with pairing third‑party power meters via Bluetooth" or "other minor issues and improved device stability"?

    I didn't want to install the beta yet without confirmation because there is no way back, and it could be a long time before a stable version is available.

  • 0 1 month ago

    I have the same problem. In my case, my HR-strap is capable of BT and ANT+. When I try to connect over BT, i get the same error and it won't connect at all. However, the same HR strap does work with my Laptop and Zwift over BT just fine.

    Furthermore, I have a Forerunner 945LTE that does accept the sensor perfectly fine over ANT+. When I try to connect over ANT+ with my Edge, it will tell me that it has no secure connection, asking if I want to connect anyway. I can then proceed and the sensor is added. However, I don't get data out of it. It connects every 20-30s and shows the HR for 1s or 2s and then drops again. It is as of right now completely broken. I don't have to mention that Heart Rate is beneath power one of the most important metrics and it is a joke that I buy a premium product for >400€ that just does not work in that regard.

  • 0 1 month ago in reply to 2862490

    Thanks for telling your background. I just wanna ask how old your HR strap approximately is. 

    If you're willing to try the 27.xx beta feel free to report here.

  • 0 1 month ago in reply to franz134

    I think it's from 2018 or 2019, so definitely without "secure connection".

  • 0 1 month ago in reply to 2862490

    I just installed the 27.09 beta and it works again (at least in my case)

    The connecting process took a while (maybe 20sec) that I thought it might fail again, but in the end it works