Hello
Would Toshiba like to send me a new motherboard?
LOL
I doubt this because why Toshiba should sent you a new motherboard?
The BIOS update is not covered by warranty and it should only be done if you have a problem with your notebook and not just for fun.
What you can do now is to contact the nearest ASP. The technicians can try to reflash the ROM module but in worst case your motherboard must be exchanged.

Here you can search for the nearest ASP:
http://eu.computers.toshiba-europe.com => Support & Downloads => Find an authorized service provider
Greets