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I wanted to pair a bluetooth device (specifically, Dynamo Harvester) with my Moto G 2 (Android 6) with the normal workflow: Open bluetooth system settings, scan for devices, select Dynamo Harvester, enter the PIN and it is paired.

Now, after entering the wrong PIN (0000 instead of 000000) several times – where most of the time a message was displayed that the PIN was wrong –, I entered the correct PIN, and something strange happened. The Incorrect PIN message popped up for a brief moment, and afair the device moved to the list of paired devices.

Since the app still did not recognize the Dynamo Harvester, I turned bluetooth off and on again. Now the device has disappeared from the list of paired devices, but appears in the scan list. If I try to pair, I cannot enter a PIN anymore but receive a message Can't communicate with Dynamo Harvester.

I thought that perhaps the device is broken somehow, but connecting with a Samsung Android tablet worked just fine (with the correct PIN).

What can I do? Might this even be a bug in Android because of the strange message about the incorrect PIN, although it was correct?

Bluetooth; can't communicate with Dynamo Harvester

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    Did you read the FAQ? You don't pair it in System Settings like a normal BT device, you have to pair it in the app... "Some Bluetooth devices are to be paired in the system settings. However, de Dynamo Harvester is paired in the Setup menu of the app". be-on-bike.de/en/harvester/faq.html#BLUE1
    – acejavelin
    Commented Jun 22, 2016 at 15:26

3 Answers 3

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AFAIR (this is many years ago and I don't use the Dynamo Harvester anymore due to lack of a dynamo and the bike itself too) I could pair the Dynamo Harvester from the app itself. Pairing it from the System's Bluetooth dialog did not work, probably because that dialog mainly pairs audio devices.

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I recently had a similar problem though different devices (Android Google Nexus 7 running Marshmallow and Motorola Buds Bluetooth headset). Turns out the headset needed a reset to forget all the devices it had learned. Since I switch between devices, I suspect my data in the headset itself had become corrupted. In any case this fixed my problem. You might try finding a headset reset for your device and see if that fixes your problem. You may also need to have your phone/tablet forget all the devices, too, as that has helped me in the past.

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Go to setting / system / reset /reset Wi-Fi and Bluetooth.

Turn on Bluetooth. Search device and tap on it. It will ask pin. Enter your pin.

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