I know that the X99 Motherboards have this but my X79 Dark and X79 Classified Motherboards do not.
 
On the X79 you need to create a UBS Flash Boot, How did you update to 2.13?
 
Looking on my X79 Dark now. This is not a process that the X79 Can do.
I do have select Bios file on the X99 though.
 
Make sure your do this BEFORE you update the Bios. You can also Press and Hold the small Red Button to clear the CMOS as well, this is what I do and then plug in the USB Flash and Boot up and run the command update.
First go into your BIOS and load defaults, save and exit 
This is the only way I know. But this is from a Boot USB Flash Drive.
USB Flash/DOS Drive Installation

• Create a bootable disk.
• Extract the above .zip file to your bootable disk.
• From a DOS prompt, run DOS_Update.bat

• Press Y in to start the flash process
• DO NOT TURN OFF POWER OR RESET DURING THE FLASH PROCESS
• After the flashing is finished, shut the system down completely. Then power on again.

After flashing verify that the correct flash was applied by checking the version number on the lower right corner of the BIOS screen.
 
 
 
How to Create a Boot USB Flash Drive, thank you Lvcoyote
 
I use this below settings in my CONFIG.SYS file.
 
device=HIMEM.SYS /testmem:off
dos=high,umb
files=64
buffers=32
stacks=9,256
 
And change the AUTOEXEC.BAT file to what is below or delete it.
@echo off
 
 
When done turn off your computer for 2 or 3 minutes, a restart is not the same.

dustingg
you can easily update from win as well. just open a admin cmd and run the bat file. reboot and configure

+1.
 
Flashing a different bios in Windows works very well and is a quick & easy method.

I have updated from within Windows and also DOS using a bootable USB drive. However, I was reading the description/release note of 2.13 and saw the section of where I can update within the BIOS (see my original post quote), so I thought it was an added functionality with 2.13. I guess not at this point.
 

LFaWolf
Hello, so I updated my BIOS to v2.13. However, thinking about the next update, I was on the Save&Exit tab but saw no option to choose a BIOS file. I thought v2.12 did that but I am not sure, because I upgraded from v2.10. I am reading the BIOS Release Note and it said -
BIOS Installation  

• Extract the contents of .zip file to USB flash drive (must be formatted as FAT32)
• Reboot the machine and go into the system BIOS

• From the BIOS, navigate to the Save & Exit tab and open "Select BIOS File."
• Select the .bin file you wish to flash.

 
Am I not reading this right?
 

 
 
First up, both the systems in your signature say ASUS Rampage IV Extreme, so....   
 
 
For my EVGA X79 Dark, I did the windows install as specified:
 
Windows Installation

• Download the correct .zip file below for your motherboard:

         150-SE-E789-KR - EVGA X79 Dark       
         151-SE-E779-KR - EVGA X79 Classified
         151-SE-E777-KR - EVGA X79 FTW
         132-SE-E775-KR - EVGA X79 SLI

• First go into your BIOS and load defaults, save and exit
• Close all open programs.
• Go into the folder where you unzipped this package and update.bat (right click, run as admin)
  
• When prompted, press Y and [enter] to start the flash process
• DO NOT TURN OFF POWER OR RESET DURING THE FLASH PROCESS
• After the flashing is finished, when prompted, hit any key to continue. The system will automatically shut down. Then power on again and go into BIOS to set up.