cheapest is to do it yourself, but i have just got a LEH189~~~~ which i don't think can be done yet as it has new board, and i think yours might be same.
but Infectus are supposedly releasing a firmware tonight to flash teh argon chip to make it ready for the new D2C2 boards.
i have just recieved 5 more chips to use, (as i have sold 2 and used 2 in last 24 hours from my old stock).
i helped hackmax out couple weeks ago, and can do same for you if you want or post one out to you with new firmware on when it's released.