didnt play with it, im currently generating my own common.ecs .. and man, on my trusty old linux box this takes *AGES* - i patched up a ecsign that uses the hash (serial+option code) that we need, idea is to then dump the values into the main.c and see what happens.
i did modify a few bytes in the firmware and flashed it, no probs - verfied with jtag that bytes are indeed in RAM after bootup - so lets see what happens when main.c works with my private/pub key, and when i flash those ;-)