I needed to build Meshtastic firmware on WSL in order to produce binary UF2 firmware for the Meshtastic XIAO BLE variant.

Here's what I had to do.

1. Install Debian from the Microsoft Store
2. Open and set up user

3. sudo apt-get install git python3-venv

4. curl -fsSL -o get-platformio.py https://raw.githubusercontent.com/platformio/platformio-core-installer/master/get-platformio.py 
   python3 get-platformio.py

1. git clone https://github.com/meshtastic/firmware.git meshtastic-firmware && cd meshtastic-firmware
2. Optional: check out a tagged release
   

   git checkout tags/v2.3.8.d490a33

3. git submodule init
4. git submodule update

1. pio run -e xiao_ble

2. cp firmware.uf2 /mnt/c/Users/YOUR_WINDOWS_USERNAME/Desktop/

1. Connect the XIAO BLE to the computer USB and double tap the reset button, the red LED will breathe and a USB drive “XIAO-BOOT” will be mounted
2. Copy firmware.uf2 from your desktop to the USB drive