Hold down the button labelled "boot" on the components side while plugging in your controller. (If you can only access the other side of the controller, you can bridge the hole marked "boot" to the 5th pin-hole on the right side, while plugging plugging it in)
A file explorer window should automatically open with a drive named "RPI-RP2".
You can now drag and drop your .uf2 firmware into this drive. It should then close and reset the controller
Done, the firmware is now installed on your controller! Now you've done it this way once, you can access bootloader mode by double tapping the reset button on you keyboard!
