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For those of you who have Windows installed on your system, each motherboard manufacturer has a website page on how to update the BIOS (see Option 2). However, the following methods are alternatives to updating the BIOS in Windows with a motherboard manufacturer's own utilities.
CAUTION: DO NOT POWER DOWN OR INTERRUPT THE FLASHING PROCESS ONCE IT HAS STARTED. DOING SO COULD MAKE YOUR MOTHERBOARD COMPLETELY UN-USABLE. LET THE PROCESS COMPLETE ON IT'S OWN
The following guides are for updating Gigabyte motherboard BIOS.
Option 1: Q-Flash Method
Motherboard BIOS utiity. Prepare from OS X. Easy Method for GUI oriented souls.


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___The Unarchiver, UnRarX or a similar utility as Apple's OS X Archive app doesn't unpack
___".exe" files;

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Today, most new USB thumb drives come pre-formatted in FAT32, so you can change the name in the Finder by single clicking the USB drive "NO NAME" and pressing the Return key which will highlight the "NO NAME", and you can rename it.



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Congratulations! You've now updated your BIOS.
Option 2: @BIOS Method
Gigabyte supplies a Windows app to update your BIOS. If you have a windows installation, this could be a good option, as it's supplied on the motherboard DVD and Support downloads. See the official document here.
Option 3: USB Drive with FreeDOS + BIOS file
However, if you can deal with the olde MS-DOS prompt, then here are a few more options for you. (Not for the faint of heart.)
Method 1: (Create a USB Flash drive on OS X) MacMan's Guide for using FreeDOS on a USB Thumb Drive. But, first, boot into the BIOS and note the settings that you changed as part of your initial installation.
Method 2. (Create a USB Flash drive on Windows) Recommended by wildwillow. This method has an excellent guide here. But, first, boot into the BIOS and note the settings that you changed as part of your initial installation.
Method 3. (Create a USB Flash drive on Windows) trs96 found this (XP through 8.1) Method using Efiflash* (included in UEFI BIOS downloads) and Rufus on a 8GB USB thumb drive.



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___(delete the autobat file as it isn't needed);



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Code:
C:/>Efiflash[COLOR=#FFFFFF]_______________[/COLOR]<--- This will start the Efiflash tool.
C:/>Efiflash <BIOS file>[COLOR=#FFFFFF]___[/COLOR]<--- For example, Z87MXD3H.F4

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* FLASHSPI.EXE was used in earlier Gigabyte BIOS releases instead of Efiflash.exe. Same use.
Gigabyte Socket 1150 Haswell 8-Series Motherboards:
http://www.gigabyte.com/products/list.aspx?s=42&jid=0&p=2&v=31
Gigabyte Socket 1155 Ivy Bridge 7-Series and Sandy Bridge 6-Series Motherboards:
http://www.gigabyte.com/products/list.aspx?s=42&jid=0&p=2&v=24
Gigabyte Socket 1156 5-Series Motherboards:
http://www.gigabyte.com/products/list.aspx?s=42&jid=0&p=2&v=11
Gigabyte Socket 1156 X58 Motherboards:
http://www.gigabyte.com/products/list.aspx?s=42&jid=0&p=2&v=1
Gigabyte Socket 2011 X79/C606 Motherboards:
http://www.gigabyte.com/products/list.aspx?s=42&jid=0&p=2&v=28
How to Reflash BIOS:
http://www.gigabyte.com/webpage/20/HowToReflashBIOS.html
Related:
http://www.tonymacx86.com/dsdt/124646-gigabyte-beta-bios-modified-bios.html
http://www.tonymacx86.com/general-help/38604-gigabyte-backup-bios.html
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