I have everything in place to flash the unit, from my pi, but as i was seeing such good numbers ( as im writing this its running at 7.7 avg ) I started to think twice, hence my posts here.
7.7 GH/s avg for 2 chips is nice (on stock? interesting to see what firmware you got??)
You might think you can flash it via USB, but you need an JTAG programmer such as the Atmel AVR DRAGON afaik...you have that?