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your link does not work for me. > dmesg | grep -i Bluetooth ``` [ 8420.573378] Bluetooth: Core ver 2.22 [ 8420.573394] Bluetooth: HCI device and connection manager initialized [...

I already added the brcmfmac43241b4-sdio.txt as described in 1 and 2. The kernel is 4.1. The udevadm info -e output is in the attached file [udevadm.txt](https://github.com/winterheart/broadcom-bt-firmware/files/1768742/udevadm.txt)

After following the instructions the bluetooth chip is recognised, but its connections are really unstable. Though it is not possible to use it for my mouse, it does not connect,...

Now after `btattach --bredr /dev/ttyS4 -P bcm &` it stucks while scanning for devices, making it impossible to connect. The output of new `dmesg` is attached again. [dmesg.txt](https://github.com/winterheart/broadcom-bt-firmware/files/1770898/dmesg.txt)