Nothing here is locked down — the automatic route above just saves you the clicking.
- Download the .uf2 from blipfrog.com/firmware.
- Triple-click the button on the dongle. A drive called RPI-RP2 appears.
- Drag the .uf2 onto it. The drive vanishes on its own — that means it worked.
Same thing if an update ever goes wrong: hold the dongle's button while you plug it in and you land on RPI-RP2 no matter what state the firmware is in. There is no way to brick it from this page.