^^ Depends what you did to it.
If you have a proper bill and its purchased with distri's sticker with it, assuming it has warranty left, just RMA the board. When they ask, don't tell about the flashing incident. There are situations that its best to act like a n00b to get things done, this is one of them. Even if the board is bricked due to wrong bios flashing and warranty is not there, assuming the board is still manufactured, pay a bit to the distris and they will get it repaired, most likely change the bios chip or maybe a replacement unit.