It's not something that could be improved with a BIOS update, components capable of powering those CPUs would have to be present on the board in the first place. But saying up to 125w then having a 140w CPU in the list is likely just a mistake. Most boards, especially ones meant for OCing, can support much higher wattages than the max TDP they advertise - when you OC (or more specifically over-volt) a CPU you can raise its effective TDP massively.