Koolatron over at the Bitcraze forum re-program the Crazyradio over SPI using the BusPirate and this script, available at github:
I’ve knocked together a perl script to reflash a busted crazyradio over SPI using a Bus Pirate. This saved me from a firmware upgrade gone bad.
Get an assembled Bus Pirate for $30, including world-wide shipping. Also available from our friendly distributors.