> For the complete documentation index, see [llms.txt](https://headtracker.gitbook.io/head-tracker-v2.2/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://headtracker.gitbook.io/head-tracker-v2.2/getting-started/software-installation/flashing-firmware.md).
# Flashing Firmware
The first step to getting this working is to flash the firmware onto the Nano 33 BLE.\
From the GUI choose Firmware, Upload firmware
Pick the most recent one available from the Online Firmware source that matches the board you have. If you own the **original BLE Sense, choose the Arduino Nano 33 BLE**. The sense Rev 2 is only for the newest board from arduino.
Click Program. Then plug the Nano into your computer with a USB cable.
Once you see Programming Successful, go ahead and click close. That's it.
{% hint style="info" %}
If you are unable to program and stuck on the step "**Waiting for Com Port**" Try **double tapping the reset button** on the board while on this step. Reset is the white button on the Nano33 series of boards. This will force bootloader mode on the board. The indicator led should **increase and decrease in intensity when in bootloader** mode.\
**Note**: Waiting for programming port will take longer than normal before it tries the first port found.\
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If this still does not help, try another USB cable and/or a different USB port.\
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If this still does not work there is probably a driver issue. Double tap the reset button, be sure the LED indicator shows it's in bootloader mode. When in this mode you should have a COM port listed on your PC. If not you will have to try using utilities such as Zadig to change the driver used.
{% endhint %}