I also had same problem in using @BIOS to flash my Gigabyte GA-P35-DS3L in Widows, but luckily I saved current BIOS to the HD before flashing and get error. Rebooted & it recovered right away. Now try using other computer to download from Gygabyte the BIOS firmware for your MB (somehow to extract it in form a ___.bin file)
Take your HD into USB HD enclosure and plug in that computer & copy that _.bin file to the root directory of your HD. Put back your HD to your computer and boot. Hopefully it works.
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