AMD Motherboards - EPYCD8/2T - Cannot Disable Secure Boot

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EPYCD8/2T - Cannot Disable Secure Boot

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=12890
Printed Date: 05 Aug 2025 at 11:31pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: EPYCD8/2T - Cannot Disable Secure Boot

Posted By: gordan
Subject: EPYCD8/2T - Cannot Disable Secure Boot
Date Posted: 15 Nov 2019 at 10:25pm

Hi,

I'm trying to install CentOS on the EPYCD8. I cannot seem to disable Secure Boot bully on this board. I erased all the keys which puts it into "setup mode", but even so when I try to boot the installer ISO, it says that vmlinuz has invalid signature.

The BIOS seems to be the latest: 2.30.

How do I disable secure boot on this board?

Replies:

Posted By: gordan
Date Posted: 05 Dec 2019 at 8:27pm

OK, I figured this out. The problem wasn't secure boot at all - the problem is that this motherboard is extremely finicky about USB storage devices it works with. The problem is particularly bad with USB3 devices and the faster they are the less likely they seem to work.

I eventually found a slow USB2 storage device to install from that wasn't erroring out.

As far as I can tell this is a firmware bug.