B650Pro RS Protected memory issue 4.03
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=113429
Printed Date: 25 Feb 2026 at 9:54am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: B650Pro RS Protected memory issue 4.03
Posted By: Deafbutnotdead
Subject: B650Pro RS Protected memory issue 4.03
Date Posted: 07 Jan 2026 at 1:46am
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Hello I have the B650Pro RS, which runs fine with the BIOS 3.50, but if I update to the 4.03 I see an error message when booting into Arch Linux EFI stub: Warning: unable to protect memory? Though Arch boots and runs fine Re-flashing back to 3.50 and no message again Bug in the 4.03 bios, or does something need to be changed in the bios settings If need be please move this message to the correct section |
Replies:
Posted By: vistra
Date Posted: 14 Jan 2026 at 8:38pm
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I have the exact same issue. I built a new PC with the ASRock B850I Lightning WiFi motherboard on Christmas Day and first thing I did was flash the BIOS to 4.03. Running Arch Linux with the standard kernel (6.18.x) I get this error after selecting boot loader: "EFI stub: WARNING: Unable to unprotect memory range [xxxxxxxxx,xxxxxxxxx]: 8000000000000009" When I boot into the LTS kernel (6.12.x) I do NOT get this message. I have not tried to downgrade to the 3.50 BIOS yet. I do not run Secure Boot, it is disabled. I also had to set the PCIe M.2 to run at Gen4 as I got btrfs CSUM errors when it was running at Gen5 (yes I have a gen5 SSD, Crucial T705 4TB). Not sure if this is related but searching found that the "8000000000000009" code is for "EFI_OUT_OF_RESOURCES" and could relate to Memory or NVMe. |
Posted By: Xaltar
Date Posted: 15 Jan 2026 at 12:24am
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Thanks for the info vistra and Deafbutnotdead, I will point ASRock to this thread. ------------- 
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Posted By: vistra
Date Posted: 15 Jan 2026 at 3:45pm
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I have a fix after finding OP thread on the Arch Linux forums. They emailed the "Asrock_TSD@asrock.com.tw" team and got a bios with a fix for this issue. I emailed this address this morning and got a reply email within 3 hours with an attached BIOS 4.03.SP01 ROM. I updated to this and the boot warning on the linux kernel no longer happens. Thank you ASRock TSD, excellent turnaround and fix! Bravo! |
Posted By: Deafbutnotdead
Date Posted: 24 Jan 2026 at 12:59am
It was me you first emailed Asrock about this error, and they sent me a 'test' BIOS, which solved my problem It seems that the 4.03 and the latest kernels aren't happy together, almost always Arch as they are basically the only Linux running >6.18 or bigger Booting back into BIOS 3.50 will solve the problem. Apparently, MSI MBs are having the same error as well, again with a user running Arch 6.18 |
vistra wrote:Posted By: Xaltar
Date Posted: 25 Jan 2026 at 3:13am
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Thanks for the added info guys, I am sure this will be hugely helpful to others experiencing this error. -------------
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Posted By: Deafbutnotdead
Date Posted: 14 Feb 2026 at 6:19pm
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For info, there is a new BIOS 4.10 Which I've flashed after testing the beta version Arch Linux boots perfectly with no error message concerning EFI stub: Warning: unable to unprotect memory range |
Posted By: Xaltar
Date Posted: 14 Feb 2026 at 6:45pm
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Thanks for the update Deafbutnotdead. -------------
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