I think you need to take help of a service engineer or eprom programmer.Pls make sure your warranty period is over.
Below is a reference from a site.
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When I need to do a BIOS REPLACEMENT or a bios replacement service?
You need a BIOS REPLACEMENT or a BIOS Replacement service usually when, due to a blackout or an interruption of the tranferring data, you registered a stop of the upgrading and flashing bios procedure that might compromise the motherboard of your pc. If you need to recover your bios from a bad bios flash or after a damaging of the bios chip we can help you with our bios reprogramming, BIOS REPLACEMENT and bios replacement service for pc, notebook and laptop.
What I need to obtain a BIOS REPLACEMENT service ?
If you don't have an eprom programmer, you need only to contact RECOVERYBIOS.COM, by connecting our
www.recoverybios.com. We can send you a new pre-programmed Bios chip within 24 hours from the receipt of the order. Our service is 360/7/24 fully functionally.
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Suggestions are based on reference.Pls try at your risk.