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Update device-specific.markdown (#16071)

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source/_docs/z-wave/device-specific.markdown
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@ -52,6 +52,21 @@ echo -e -n "...turn on/off string from examples above..." | cu -l /dev/zstick -s
You need to disable the on-board Bluetooth since the board requires the use of the hardware UART (and there's only one on the Pi3). You do this by adding the following to the end of `/boot/config.txt`:
For both processes below you will need to insert your SD card into your PC and open the `/boot/config.txt` file with your favorite text editor.
#### Raspberry Pi 4 procedure
Add the following paramaters to the bottom of the `/boot/config.txt` file.
```text
dtoverlay=disable-bt
enable_uart=1
```
Reboot your Pi 4 without the Razberry Z-Wave hat first. Then shutdown, add the hat back, and boot again.
#### Raspberry Pi 3 procedure
```text
dtoverlay=pi3-disable-bt
```