Bluetooth Problem hcitool not working

Hi
actually i try to setup the miflora sensors. for this i need a running bluetooth device. i have really heavy problems to get it running. have anybody an idea how to fix it? I have installed Openhab and Homegear with the HM-MOD-RPI-PCB.

[12:41:48] openhabian@openHABianPi:~$ sudo systemctl status hciuart.service
● hciuart.service - Configure Bluetooth Modems connected by UART
   Loaded: loaded (/lib/systemd/system/hciuart.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sun 2018-03-25 12:41:48 CEST; 21s ago
  Process: 10069 ExecStart=/usr/bin/btuart (code=exited, status=1/FAILURE)

Mar 25 12:41:18 openHABianPi systemd[1]: Starting Configure Bluetooth Modems connected by UART...
Mar 25 12:41:48 openHABianPi btuart[10069]: Initialization timed out.
Mar 25 12:41:48 openHABianPi btuart[10069]: bcm43xx_init
Mar 25 12:41:48 openHABianPi systemd[1]: hciuart.service: Control process exited, code=exited status=1
Mar 25 12:41:48 openHABianPi systemd[1]: Failed to start Configure Bluetooth Modems connected by UART.
Mar 25 12:41:48 openHABianPi systemd[1]: hciuart.service: Unit entered failed state.
Mar 25 12:41:48 openHABianPi systemd[1]: hciuart.service: Failed with result 'exit-code'.