Preconfigured for the PicoFX PCB pin mappings with 6 LEDs. Simply drop the appropriate .uf2 onto your Pico while in programming mode and you're good to go!
If using surface mounted RGB LEDs, pick the "PicoFX" binary.
If using an external LED strip, pick the "PicoFX_Strip" binary, otherwise the red and green lights on the left hand side will be inverted.
Both of the above are configured for 6 RGB LEDs. If you're using more or fewer than 6 RGB LEDs, you'll need to modify and compile the firmware yourself.