@RSMilward the DuetWifi got a rebranding to Duet 2 when we:
Released an Ethernet version. Released Duet 3.The Duet "1" (never called that) was 0.6 and 0.8.5 +other esoteric prototypes.
All Duet 2s have the same processor and stepper drivers so, while we upgrade them, are all stills supported in firmware.