voilà mais il semblerait que j’ai le même problème 
> pi@raspberrypi:~ $ sudo systemctl stop bluetooth
> pi@raspberrypi:~ $ sudo systemctl enable bluetooth
> Synchronizing state of bluetooth.service with SysV service script with /lib/systemd/systemd-sysv-install.
> Executing: /lib/systemd/systemd-sysv-install enable bluetooth
> pi@raspberrypi:~ $ sudo systemctl start bluetooth
> pi@raspberrypi:~ $ sudo systemctl status bluetooth
> ● bluetooth.service - Bluetooth service
> Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
> Active: active (running) since Thu 2020-01-09 14:40:29 GMT; 6s ago
> Docs: man:bluetoothd(8)
> Main PID: 8591 (bluetoothd)
> Status: "Running"
> Tasks: 1 (limit: 4915)
> CGroup: /system.slice/bluetooth.service
> └─8591 /usr/lib/bluetooth/bluetoothd
>
> Jan 09 14:40:29 raspberrypi systemd[1]: Starting Bluetooth service...
> Jan 09 14:40:29 raspberrypi bluetoothd[8591]: Bluetooth daemon 5.43
> Jan 09 14:40:29 raspberrypi systemd[1]: Started Bluetooth service.
> Jan 09 14:40:29 raspberrypi bluetoothd[8591]: Starting SDP server
> Jan 09 14:40:29 raspberrypi bluetoothd[8591]: Bluetooth management interface 1.14 initialized
> Jan 09 14:40:29 raspberrypi bluetoothd[8591]: Failed to obtain handles for "Service Changed" characteristic
> Jan 09 14:40:29 raspberrypi bluetoothd[8591]: Sap driver initialization failed.
> Jan 09 14:40:29 raspberrypi bluetoothd[8591]: sap-server: Operation not permitted (1)
> Jan 09 14:40:29 raspberrypi bluetoothd[8591]: Endpoint registered: sender=:1.5 path=/MediaEndpoint/A2DPSource
> Jan 09 14:40:29 raspberrypi bluetoothd[8591]: Endpoint registered: sender=:1.5 path=/MediaEndpoint/A2DPSink
> pi@raspberrypi:~ $ sudo systemctl stop hciuart
> pi@raspberrypi:~ $ sudo systemctl enable hciuart
> pi@raspberrypi:~ $ sudo systemctl start hciuart
> Job for hciuart.service failed because the control process exited with error code.
> See "systemctl status hciuart.service" and "journalctl -xe" for details.
> pi@raspberrypi:~ $ sudo systemctl status hciuart
> ● 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 Thu 2020-01-09 14:41:58 GMT; 12s ago
> Process: 8951 ExecStart=/usr/bin/btuart (code=exited, status=1/FAILURE)
> Main PID: 598 (code=exited, status=0/SUCCESS)
>
> Jan 09 14:41:28 raspberrypi systemd[1]: Starting Configure Bluetooth Modems connected by UART...
> Jan 09 14:41:58 raspberrypi btuart[8951]: Initialization timed out.
> Jan 09 14:41:58 raspberrypi btuart[8951]: bcm43xx_init
> Jan 09 14:41:58 raspberrypi systemd[1]: hciuart.service: Control process exited, code=exited status=1
> Jan 09 14:41:58 raspberrypi systemd[1]: Failed to start Configure Bluetooth Modems connected by UART.
> Jan 09 14:41:58 raspberrypi systemd[1]: hciuart.service: Unit entered failed state.
> Jan 09 14:41:58 raspberrypi systemd[1]: hciuart.service: Failed with result 'exit-code'.
> pi@raspberrypi:~ $ sudo systemctl daemon-reload
> pi@raspberrypi:~ $
encore merci