Unsurprisingly, it's entirely possible to enter DFU mode to reflash the 8u2 with (say) keyboard firmware.
It's that that things are in slightly different places on the Pebble v2
Connect the board to your computer via USB. Put a jumper between the two left-most pins on the group marked "8u2 ISP" (it's near the left side of the board). Stick one end of a wire in a "GND" header, and tap on the left-hand "Boot" pad (it's right under the 8u2 ISP header). Remove the wire, remove the jumper, you should now be in DFU mode.
From there, follow the normal "dfu-programmer" instructions.
(Note if you want to build any LUFA-based projects yourself, you'll probably need to use LUFA 100807 rather than the latest version - I got weird build errors until I rolled back).
The Pebble is an Arduino-compatible board with a bunch of built in sensors and other devices, including support for ZigBee wireless mesh networking. Great for datalogging or general experiments.
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