A couple reports indicate issues with the bootloader

A solution is to upload the latest leonardo bootloader to Nova. The procedure is simple, requiring only a ISP programmer. plug in the ISP wires and flash the leonardo bootloader onto the nova board again, unbricking the Nova.

On a side note, beware the battery connector, must be kept away from the pins on board, failing to do so could break the pins or even the controller if shorted. Electric tape on top of the pins could potentially help avoid this problem.