Help with a Motherboard

[MidNite36]

How can I upgrade a motherboard BIOS? I have a motherboard with me here with no name on it, I guess its a Chinese motherboard because Chinese words are written on it, with J&W, I got this motherboard for a cheap price maybe that's why its full of issues? It won't detect more than 4 graphic cards at once and all ports for gpu are working.