Intel Motherboards - Z170 Extreme6+ Mac Address Invalid

Z170 Extreme6+ Mac Address Invalid

Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=1268
Printed Date: 18 Jul 2025 at 12:15pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Z170 Extreme6+ Mac Address Invalid

Posted By: dcw
Subject: Z170 Extreme6+ Mac Address Invalid
Date Posted: 18 Nov 2015 at 8:57am

Newcomer here, hoping someone can help.

2 days ago I purchased an Asrock Z170 Extreme6+ m/b, and build a PC with 8GB Patriot DDR4 RAM and Core i5-6600.

To cut a long story short, on each boot it now displays a message saying that the "Intel MAC addresses are invalid in both CMOS and Flash"

I can only continue by pressing F1. Needless to say this is more than an inconvenience!

Having researched the issue I have found quite a few instances where other people have had similar problems with Asrock motherboards in the past, and the fix seems to involve re-setting the MAC address using a tool that can be downloaded here:

http://www.asrock.com/support/download/mactool.asp" rel="nofollow - http://www.asrock.com/support/download/mactool.asp

However, even if this is the correct solution, I would need to know my MAC address. On the edge of the board I have found 2 sets of numbers that could be MAC addresses (i.e. 12 characters 0-F), but neither of them seem to have a Asrock prefix. One prefix is D06099 and the 057F18 and neither is written in the usual MAC address format nn-nn-nn- etc.

The problem may be that there is a cowling over the Ethernet ort on the m/b, so the real MAC address may be shown under there.

Does anyone have any suggestions other than to take it back? Even if I had the MAC address, would this tool work for my motherboard? Could I use a randomly generated MAC address?

For the record, I have built around 30 PCs over the years, and have never had this problem. I almost always use Gigabyte boards, but thought I'd try something different this time - not impressed!

Cheers

David

Replies:

Posted By: dcw
Date Posted: 18 Nov 2015 at 8:59am

Oh, just to add, I put in a request for assistance to Asrock (by form) yesterday. So far I have only received an acknowledgement.

How long do they usually take to get back?

Posted By: dcw
Date Posted: 20 Nov 2015 at 9:18am

This issue is now resolved thanks to assistance from Asrock Support. I thought I'd post this to assist anyone else who might have the same problem.

Probably best to contact Asrock as I did to get instructions for your particular motherboard. When I did so, they replied with this email:

Dear customer,
Thank you for contacting ASRock.
Please download the tool from the link to re-write the MAC.
download link:
http://www.asrock.com/support/Download/mac161B.zip" rel="nofollow - http://www.asrock.com/support/Download/mac161B.zip
Please open the chassis and you can find a sticker on PCB with MAC id.
Save the tool in a bootable disk and boot, key in as follow:
A:/>mac <enter>
It will list the function key description, then please key in as follow:
A:/>mac c [mac ID] <enter>
If it is success, it will show following information:
MAC ID:XXXXXXXXXXXX SUM: XX
Write MAC function call OK.

About the MAC address, it's 12 characters please refer to attach file.

Thanks for your E-mail.

Have a great day
ASRock TSD

The link appears to be different to the one I posted earlier, so may be specific to the motherboard.

I followed their instructions, but the first time I tried it didn't seem to work. Windows reported the new MAC address correctly, but I was still getting the same message from the BIOS.

I cleared the CMOS using the button on the rear panel, and rebooted but I still had to press F1 to continue, so I repeated the MAC write instructions again and this time it fixed the problem completely.

The attached file they referred to contained a picture of my motherboard showing where to find the MAC address. In my case it was on the edge of the board near the Power & Reset buttons beside the memory slots.

Posted By: jared779
Date Posted: 04 Dec 2016 at 1:01pm

Updated my bios from P1.4 to P2.10 and had no effect (not that one was expected, but it's a good start).

The solution posted also confirmed working for my Asrock Z97M Pro4.

I followed the steps.

Created bootable FreeDOS flashdrive using the Rufus utility.
Copied the above zip onto the drive.
Booted to drive and completed the steps above.

Thanks!

Posted By: wardog
Date Posted: 04 Dec 2016 at 2:44pm

FYI, ASRock MAC Address prefixes that your motherboard may contain can be discovered on the following page:

https://www.adminsub.net/mac-address-finder/asrock" rel="nofollow - https://www.adminsub.net/mac-address-finder/asrock

http://www.netlookup.se//vendor/name/ASRock+Incorporation" rel="nofollow - http://www.netlookup.se//vendor/name/ASRock+Incorporation