If you want to get set up quickly with the same lighting patterns I used in my model, all you have to do is copy a single file onto the QT Py RP2040. You won't be able to customize this file, but it is as easy as drag-and-drop to get started.

To customize, check out the CircuitPython and Code the Lighting Controller pages.

To enter the bootloader, hold down the BOOT/BOOTSEL button (highlighted in red above), and while continuing to hold it (don't let go!), press and release the reset button (highlighted in blue above). Continue to hold the BOOT/BOOTSEL button until the RPI-RP2 drive appears!

If the drive does not appear, release all the buttons, and then repeat the process above.

You can also start with your board unplugged from USB, press and hold the BOOTSEL button (highlighted in red above), continue to hold it while plugging it into USB, and wait for the drive to appear before releasing the button.

A lot of people end up using charge-only USB cables and it is very frustrating! Make sure you have a USB cable you know is good for data sync.

You will see a new disk drive appear called RPI-RP2.

Drag the lego_lighting_01.uf2 file to RPI-RP2. 

The RPI-RP2 drive will disappear and a new disk drive called CIRCUITPY will appear.

That's it, you're done, the lights will automatically start running.