> For the complete documentation index, see [llms.txt](https://docs.acecentre.org.uk/products/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.acecentre.org.uk/products/relaykeys/installation/supported-boards/bluefruit-le-friend.md).

# Bluefruit LE Friend

![](https://1065911005-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ftmmq04xl8IrJjV6lZCnr%2Fuploads%2FdVNB5x67M7VA4mRTyFSF%2Fimage.png?alt=media\&token=99a9bed1-d37a-440b-a35e-a40f3eb3f725)

{% hint style="info" %}
Although it *should* work - and we promise you it *did* work - something has broken functionality working with the LE friend. So we aren't **officially** supporting this right now
{% endhint %}

* [Install the CP2104 Driver](https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers)
* Update it to 0.8.1. Easiest way to do this is to connect to using the Bluefruit app - it will auto-update it if required.
* Plug it in
* Set the switch on the device to CMD mode
* Open up a serial terminal and connect to the device (See [here](https://learn.adafruit.com/introducing-adafruit-ble-bluetooth-low-energy-friend/terminal-settings#terraterm-windows-5-2) for exact settings for your Operating System)
* Turn on HID Mode. More info [here](https://learn.adafruit.com/introducing-adafruit-ble-bluetooth-low-energy-friend/ble-services#at-plus-blehiden-14-31). To be precise - enter this into your serial terminal

  ```
    AT+BLEHIDEN=1

    ATZ 
  ```

(You should see 'OK' after each entry)

* Next change the default speed. i.e. enter this in your serial terminal:

  ```
    AT+BAUDRATE=115200
  ```
* Next put the device into [DATA mode](https://learn.adafruit.com/introducing-adafruit-ble-bluetooth-low-energy-friend/uart-test#blefriend-configuration-6-3) (slide the switch).
* Finally - update the relaykeys.cfg file with

  ```
    baud = 115200
    
  ```

(Or whatever speed you so wish)


---

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