You will need the CWT Programming Kit 0501-B0810 supplied by Flowbird. The kit contains:
•Segger J-link ARM JTAG (interface) emulator.
•Development tool Atmel® AVR® JTAGICE mkII with fixed 10-pole ribbon cable, USB cable and a 10-pole to 6-pole adapter. This tool is used to update AVR firmware in all CWT models as described in CWT C AVR update instructions.
•Extension cable, 10-pole (Cale 0540-00123) used for AVR programming only.
Figure 1. The J-link JTAG emulator
You also need the CWT OS Software Installation Package supplied by Flowbird.