ASRock x99 Extreme 4 stopping boot to Windows 10

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 ASRock_TSD wrote:

Dear ualdriver,
Greetings, this is ASRock TSD.

Please follow the below steps to re-flash MAC address :

Step 1. Please download the MAC Tool(Version 2.07A) in the link below:
http://www.asrock.com/support/download/mactool.asp
Step 2. Put the file into a boot-able USB device and unzip it.
Step 3. Reboot system then press[F11] to enter the Boot Menu.
Step 4. Select your "USB device" in the Boot Menu, afterward ,system will enter DOS environment.    
Step 5. Please key in the command below:
(1) DIR( press enter)
(2) cd MAC207A( press enter)
(3) MAC (press enter)
(4) MAC c xxxxxxxxxxxx (xxxxxxxxxxxx is the MAC address which post in the edge of motherboard, 12 digits in total)

After key in the command, the system will re-flash MAC automatically.

Thanks!

All the best,
ASRock TSD

Hello-

I can't get this to work.  I downloaded the file, unzipped the file, put all the unzipped files onto two separate, freshly formatted USB drives, and am not having any luck.

With one USB stick, when I  hit F11 and select it, it just boots straight to Windows.  With the other USB stick, I get an error that says "An operating system was found........" and when I hit any key to continue, it boots to Windows.

Is there an alternate way to reflash the MAC address or can you provide me with some guidance on how to get the system to boot on the USB drive with the files on it?

Thanks!