How to do it...

Let's look at the following steps:

1. Download the latest CircuitPython Circuit Playground Express UF2 file (https://github.com/adafruit/circuitpython/releases/latest). The name of the UF2 file for version 3.1.2 of CircuitPython is adafruit-circuitpython-circuitplayground_express-3.1.2.uf2. For each release of CircuitPython, there are many different uf2 files for different supported microcontrollers. Make sure that you download the file for the Circuit Playground Express device.

1. Connect the USB cable to the Circuit Playground Express and the computer.
2. Double-click the reset button located at the center of the board. If all goes well, you will see all the LEDs turn green; otherwise, there is most likely an issue with the USB cable being used. In some instances, if a double-click doesn't work, try a single click of the reset button.

1. You will see a new disk appear called CPLAYBOOT:

1. Copy the UF2 file into this drive.
2. Once the UF2 file has been fully written to the device, the firmware will be updated and a new drive will appear, called CIRCUITPY:

Now, our Circuit Playground Express can be used.