This didn't work for me but I was able to find the uf2 file that was generated when uploading FirmwareUpdater.ino.elf.uf2 in the user temp directory and manually added to the RPI RP2 drive in Windows. It would make life easier and would have saved me a whole day trying every other option to upload if the FirmwareUpdater.ino.elf.uf2 file was hosted for download somewhere.