Just being honest with you..
Its not so easy somewhat impossible but with the right tools it can be done. Risking to reflash it with the support tools from the manufacturers website. BIOS is the core component of the board. If it's under warranty contact the support of the motherboard.
This is a generalized answer in perspective. referring that you did not provide ample details of the case.
1st move contact manufacturer. and go from there.
2nd move have patience search for relative referrence over the net.
Hope it helps.