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# Bluetooth
This page describes the procedure to download MakeCode program to the EV3 brick
over Bluetooth.
## ~ hint
### WARNING: EXPERIMENTAL FEATURES AHEAD!
Support for Bluetooth download relies on [Web Serial ](https://wicg.github.io/serial/ ),
an experimental browser feature. Web Serial is a work [in progress ](https://www.chromestatus.com/feature/6577673212002304 );
it may change or be removed in future versions without notice.
By enabling these experimental browser features, you could lose browser data or compromise your device security
or privacy.
## ~
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https://youtu.be/VIq8-6Egtqs
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## Supported browsers
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* Chrome desktop, version 77 and higher, Windows 10 or Mac OS.
* [Edge Insider desktop ](https://www.microsoftedgeinsider.com ), version 77 and higher, Windows 10 or Mac OS.
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To make sure your browser is up to date, go to the '...' menu, click "Help" then "About".
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Next you need to enable the experimental features (this may change in the future)
* go to **chrome://flags/#enable-experimental-web-platform-features** and **enable**
**Experimental Web Platform features**
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## Machine Setup
* pair your EV3 brick with your computer over Bluetooth. This is the usual pairing procedure.
## Download over Bluetooth
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* go to https://makecode.mindstorms.com/
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* click on **Download** to start a file download as usual
* on the download dialog, you should see a **Bluetooth** button. Click on the
**Bluetooth** button to enable the mode.
* **make sure the EV3 brick is not running a program**
* click on **Download** again to download over bluetooth.
## Choosing the correct serial port
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Unfortunately, the browser dialog does not make it easy to select which serial port is the brick.
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* On Windows, choose ``Standard Serial over Bluetooth``. There might be multiple of those but only one works. Try your luck! Once you know the COM port number, remember it for the next time around.
* On Mac OS, choose ``cu.BRICKNAME-SerialPort``
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## Known issues
* We do not detect properly that the program is running on the brick. Make sure to stop the program before starting the download procedure.
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* The list of programs on the brick screen is not updated when uploading via bluetooth.
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## Feedback
Please send us your feedback through https://forum.makecode.com.
