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How to downgrade my Bios from A10 to A05?

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can anyone explain me how I can downgrade my Alienware M17x R4 Bios from A10 to A05 to flash an unlocked bios?

I have tried this method : http://forum.techinferno.com/alienware-m17x/1978-%5Bm17x-r4%5D-bricked-bios-fix.html but the computer never beeps, I can only see my keyboard to light up and the fan spinning fast but it never shutdown and reboot or make sounds. I must force shutdown :/

Thanks you!

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