https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sat, 13 Jun 2026 23:50:57 +0000 Thu, 25 Dec 2025 06:25:22 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=113412 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200678&title=b550-pro4-low-resolution-in-bios-winpe#200678 Author: Xaltar
Subject: 113412
Posted: 25 Dec 2025 at 6:25am

Thanks for the extra info and Merry X-mas!]]> Thu, 25 Dec 2025 06:25:22 +0000 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200678&title=b550-pro4-low-resolution-in-bios-winpe#200678 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200677&title=b550-pro4-low-resolution-in-bios-winpe#200677 Author: Quexos
Subject: 113412
Posted: 25 Dec 2025 at 6:11am

More info/FYI: It still behaves oddly. Long story short, I get weird mixed results, but no 800x600 bad ones!

For example, booting into Macrium Reflect PE "rescue disk" from an ISO on a "Ventoy" USB thumb drive in UEFI mode results in locked 2560x1080 (monitor native). Same in BIOS/CSM mode results in 2560x1080, but with a list of resolutions I can change to. This is the intended behavior.

Booting from the same files with contents of the ISO copied/extracted to a GPT partition on my internal SSD results in locked 1024x768...if I hit F11 (boot override) and select that partition from the list.

If I set that exact same partition to be the first/default boot device and boot to it that way, I get locked 2560x1080. Weird but good'nuff.]]> Thu, 25 Dec 2025 06:11:02 +0000 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200677&title=b550-pro4-low-resolution-in-bios-winpe#200677 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200673&title=b550-pro4-low-resolution-in-bios-winpe#200673 Author: Xaltar
Subject: 113412
Posted: 24 Dec 2025 at 3:32pm

Thanks Quexos, hopefully it will help someone else down the line ]]> Wed, 24 Dec 2025 15:32:10 +0000 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200673&title=b550-pro4-low-resolution-in-bios-winpe#200673 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200659&title=b550-pro4-low-resolution-in-bios-winpe#200659 Author: Quexos
Subject: 113412
Posted: 23 Dec 2025 at 11:26am

Xaltar wrote: If you are willing, could you share the BIOS they sent you here so other users that need it in the future can find it.

Sure. If someone stumbles here from a search, it may save them some trouble! I don't see any way to attach it but I'll share it on my G-Drive for now. If there's a better way/place to share it, let me know, or just grab it and put it there or whatever. I included an Info.txt in the RAR archive file to tell where/why it came from and what board it's for.

Asrock tech support Low Resolution Fix BIOS v3.90a 21 December 2025.

https://drive.google.com/file/d/1XtHUY0dK2Q-d6qrx6ZRSOG7uKW7hPH4N/view]]> Tue, 23 Dec 2025 11:26:18 +0000 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200659&title=b550-pro4-low-resolution-in-bios-winpe#200659 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200658&title=b550-pro4-low-resolution-in-bios-winpe#200658 Author: Xaltar
Subject: 113412
Posted: 23 Dec 2025 at 5:30am

Oh, the tech person you spoke to most likely had the BIOS custom made for you, either
themselves or asked one of ASRock's BIOS team to. This is exactly why I still use
ASRock products. I have seen this here on the forums more times than I can count.
They often go above and beyond to help users.

Thanks for the extra info. If you are willing, could you share the BIOS they sent
you here so other users that need it in the future can find it. It will likely
remain relevant as we are likely not going to see any more AM4 CPUs released now.


Edited by Xaltar - 23 Dec 2025 at 5:31am]]> Tue, 23 Dec 2025 05:30:41 +0000 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200658&title=b550-pro4-low-resolution-in-bios-winpe#200658 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200657&title=b550-pro4-low-resolution-in-bios-winpe#200657 Author: Quexos
Subject: 113412
Posted: 23 Dec 2025 at 3:10am

Considering so many other BIOSs have gone by that were "borked for me" but I've not heard anyone else complaining, I wonder if it's not a one off on my particular combination of hardware or something. It was the same on my Asrock B450 board that is now in my second PC though (running legacy MBR), so I just figured it was how UEFI/GPT behaves and always avoided it...but apparently not.

I suspect they actually grabbed the old 2.10 BIOS and copy pasted some relevant part of the code/package into the current 3.90 BIOS for me. We'll see if they release a "new" BIOS eventually (the board is getting a bit old now) with the fix I guess. If this was a wide spread problem, I'd have thought they would have heard all about it from everyone else by now. Who knows though. Most folks probably don't spend nearly as much time in PE/imaging software/Windows installers, etc. as I do though. I tend to tinker a lot, and fix things until they break!

Here's the still odd but better results I get with a 'rescue.iso' made from Macrium Reflect 8.1:

1. Boot from a usb flash drive in legacy BIOS mode = can change resolution to any, large list available.
2. Boot from a usb flash drive in UEFI mode = only get 2560x1080 native, no other options. This used to be unusable 800x600.
3. Boot from same files copied from ISO to partition on GPT SSD drive UEFI = 1024x768 no other options, but at least it's not 800x600 with no options!

Three is odd. Same boot files and UEFI mode, different behavior just because of USB vs SSD drive source?!?]]> Tue, 23 Dec 2025 03:10:33 +0000 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200657&title=b550-pro4-low-resolution-in-bios-winpe#200657 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200654&title=b550-pro4-low-resolution-in-bios-winpe#200654 Author: Xaltar
Subject: 113412
Posted: 22 Dec 2025 at 8:28pm

Now that is more like the ASRock I know and love

It most likely is based on the latest stable release with only the change needed
for PE to work properly altered. ]]> Mon, 22 Dec 2025 20:28:31 +0000 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200654&title=b550-pro4-low-resolution-in-bios-winpe#200654 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200653&title=b550-pro4-low-resolution-in-bios-winpe#200653 Author: Quexos
Subject: 113412
Posted: 22 Dec 2025 at 6:35pm

Woah! Asrock responded a second time and sent me a "custom" BIOS to try out and it worked! I'll be danged! Props to them. Latest BIOS is 3.90 and they sent me 3.90a which behaves like v2.10 from 2021/8/5, the last one that worked properly for me. That 2.10 BIOS was from before I even bought the board. Mine shipped with v3.40 in 2024, so it was always borked until I tried the older BIOS, which is too old for my current CPU though.

I have not used it (v3.90a) long enough to see if there are any other/new issues, but I expect not.]]> Mon, 22 Dec 2025 18:35:29 +0000 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200653&title=b550-pro4-low-resolution-in-bios-winpe#200653 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200642&title=b550-pro4-low-resolution-in-bios-winpe#200642 Author: Quexos
Subject: 113412
Posted: 19 Dec 2025 at 6:51am

Yeah, I have never gotten any actual support for any PC hardware, usually don't need any. I gave up trying decades ago. It just works or you RMA/return.

In this case I told them the issue happened in the imaging software rescue disks, which run on Windows 10 PE straight from the Windows 10 install, and in Windows 10 and 11 itself before my graphics drivers get installed. The answer is it's the wrong type of PE and it only supports Windows 10 and 11. I JUST told him it was Windows 10 itself! It's like they don't even read the question.

Anyway it worked well in BIOS 2.10 so it is clearly a BIOS issue in all BIOS' since and will never be fixed. I was open to the possibility I missed a setting somewhere or something though, but have tried pretty much everything, including different CPUs, GPUs, monitors, and every conceivable BIOS configuration. Guess I'll just have to live with it or do without UEFI/GPT/Resizable BAR.]]> Fri, 19 Dec 2025 06:51:37 +0000 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200642&title=b550-pro4-low-resolution-in-bios-winpe#200642 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200637&title=b550-pro4-low-resolution-in-bios-winpe#200637 Author: Xaltar
Subject: 113412
Posted: 18 Dec 2025 at 5:41pm

Ouch, sorry to hear that. I guess it makes sense with how harsh the market is these
days. Even I have to watch what I say incase someone tries to use my words as
"but ASRock said.." and I am just a community moderator. I have noticed the support
teams of most board partners (all really) have really locked down what they provide
assistance with these days. It's a pity, ASRock's support team was one of the
best where it came to supporting "unsupported" OSes and such. At least you got
a response.

I haven't tinkered with Windows PE since XP days so I am afraid I don't have anything
I can contribute. ]]> Thu, 18 Dec 2025 17:41:27 +0000 https://forum.asrock.com/forum_posts.asp?TID=113412&PID=200637&title=b550-pro4-low-resolution-in-bios-winpe#200637