B550 Pro4 Low Resolution in BIOS/WinPE
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=113412
Printed Date: 17 Dec 2025 at 1:01am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: B550 Pro4 Low Resolution in BIOS/WinPE
Posted By: Quexos
Subject: B550 Pro4 Low Resolution in BIOS/WinPE
Date Posted: 16 Dec 2025 at 12:42am
When booting up a WinPE based "rescue.iso" for imaging software like Macrium Reflect, Hasleo Backup Suite, etc. I get a very low (unusable in some cases, the app won't even fit in the screen) resolution of 800x600 I think it is. I think it is 1024x768 in the actual BIOS/UEFI, and I can tell GRUB to do 1080 and it will, but it defaults to something really low.
When installing Windows itself, the resolution is at 800x600 and greyed out, until I get the GPU drivers installed, making it almost impossible to navigate the setup. 800x600 is below the minimum most apps are designed for these days and the "Next" or "OK" buttons and other required dialogs are totally off screen.
I've had this problem on three different 1080p monitors, and four different GPUs, 2 Nvidia 10 and 16 series, and 2 AMD 6000 series RDNA2. One BIOS version, v2.10 from 2021 worked properly, but all since then have the problem. I can not go back to 2.10 because I have a Ryzen 7 5800XT CPU that requires v3.41 or newer.
When I ran with CSM = enabled and used legacy BIOS and MBR disks, it worked better (don't remember if it was full 1080p or just higher than 800x600), but running UEFI and GPT disks with CSM = disabled as it must be to use Resizable BAR, I have issues.
Any ideas? Setting that "Full HD" (or similar, from memory) option in the BIOS to Auto or Disabled makes no difference. I could run Legacy/CSM/MBR but I'd lose a lot of modern features and performance.
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Posted By: Quexos
Date Posted: 16 Dec 2025 at 1:00am
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No edit function? Anyway, I know BIOS 2.10 worked from when I had a Ryzen 5 5600 CPU in this main board, but am afraid to try it with a 5800XT that didn't even exist when that BIOS was released. Also, if my memory serves me, my Asrock B450 Gaming K4 had the exact same problem, only I always ran it in Legacy BIOS mode so just didn't care.
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