MEG B550 Unify enabling Resizable BAR freezes BIOS [latest BIOS version, W11]

Delicious Bacon

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Mar 8, 2021
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I've had a Windows upgrade to Windows 11 and had to update BIOS for support (had BSODs).

I took the latest BIOS and Firmware updates.

If I enable the "Re-Size BAR Support", save the BIOS settings and reboot, I am no longer able to enter BIOS—the PC freezes on entering BIOS. I can still boot to Windows, only the BIOS becomes unavailable, and requires flashing in order to access it again.

I'm certain it's that setting because I've spent the last 2 hours messing with the BIOS flashing, enabling settings one at a time and rebooting.

Here's the necessary info:

------------------
Module Information
------------------
AMD Chipset Driver 3.10.22.706
Realtek PCIE Network Drivers 11.4.1201.2021
LED FW Update(7D13) 05
MS-7D13 (BIOS MB) 1.50
MH-V389 (BIOS VGA) 143

------------------
System Information
------------------
Product Name: MEG B550 UNIFY
OS: Microsoft Windows 11 Pro 64-bit Ver.2009 (OS build 22000.613)
BIOS Version: 1.50
BIOS Release Date: 03/17/2022
CPU: AMD Ryzen 7 5800X 8-Core Processor
Memory: 32 GB @
- 16 GB DDR4-3600, Unknown F4-3600C16-16GTZNC
- 16 GB DDR4-3600, Unknown F4-3600C16-16GTZNC
Graphics: NVIDIA GeForce RTX 3080, 0 MB [MSI RTX 3080 SUPRIM X 10G]
VBIOS Version:
Drive: SSD, Seagate FireCuda 520 SSD ZP1000GM30002, 931.51 GB
 

Alan J T

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I've had a Windows upgrade to Windows 11 and had to update BIOS for support (had BSODs).

I took the latest BIOS and Firmware updates.

If I enable the "Re-Size BAR Support", save the BIOS settings and reboot, I am no longer able to enter BIOS—the PC freezes on entering BIOS. I can still boot to Windows, only the BIOS becomes unavailable, and requires flashing in order to access it again.

I'm certain it's that setting because I've spent the last 2 hours messing with the BIOS flashing, enabling settings one at a time and rebooting.

Here's the necessary info:

------------------
Module Information
------------------
AMD Chipset Driver 3.10.22.706
Realtek PCIE Network Drivers 11.4.1201.2021
LED FW Update(7D13) 05
MS-7D13 (BIOS MB) 1.50
MH-V389 (BIOS VGA) 143

------------------
System Information
------------------
Product Name: MEG B550 UNIFY
OS: Microsoft Windows 11 Pro 64-bit Ver.2009 (OS build 22000.613)
BIOS Version: 1.50
BIOS Release Date: 03/17/2022
CPU: AMD Ryzen 7 5800X 8-Core Processor
Memory: 32 GB @
- 16 GB DDR4-3600, Unknown F4-3600C16-16GTZNC
- 16 GB DDR4-3600, Unknown F4-3600C16-16GTZNC
Graphics: NVIDIA GeForce RTX 3080, 0 MB [MSI RTX 3080 SUPRIM X 10G]
VBIOS Version:
Drive: SSD, Seagate FireCuda 520 SSD ZP1000GM30002, 931.51 GB
Give this a whirl
NVIDIA GPU Firmware for Display-ID 30 series
 

Delicious Bacon

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Mar 8, 2021
Messages
19
" Without the update, systems that are connected to a DisplayPort monitor using DisplayID could experience blank screens on boot until the OS loads. This update should only be applied if blank screens are occurring on boot. "

I do not have the issue described in the Firmware update.

I can't access BIOS after enabling Resizable BAR. It worked with previous BIOS version, it's the latest BIOS version that freezes.
 

Alan J T

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Can you get back into bios if you do a Cmos reset you should have a button on back of board to do that just power of PSU and hold it in for 10 seconds
 

Delicious Bacon

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Mar 8, 2021
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Can you get back into bios if you do a Cmos reset you should have a button on back of board to do that just power of PSU and hold it in for 10 seconds
Can you please read my original post again?

If I enable the "Re-Size BAR Support", save the BIOS settings and reboot, I am no longer able to enter BIOS—the PC freezes on entering BIOS. I can still boot to Windows, only the BIOS becomes unavailable, and requires flashing in order to access it again.

I'm certain it's that setting because I've spent the last 2 hours messing with the BIOS flashing, enabling settings one at a time and rebooting.
After enabling the Resizable BAR Support, I can get back into the BIOS only after forcing the BIOS flash from the back of the motherboard ("Flash BIOS Button").

Flashing the BIOS resets all the settings, including the Resizable BAR Support (disables it) and allows me to enter the BIOS. If I then re-enable the Resizable BAR Support, entering the BIOS again freezes again.
 

Alan J T

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Cmos reset should do the same thing it is supposed to reset bios to default same as what you get when you do a Flashback.
Are you removing the Bios flash drive after you do the Flashback or leaving it in USB port.
 

Alan J T

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Also is there any Firmware updates for your GPU via MSI center Live update.
 

Alan J T

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Try a previous BIOS may help . Try BIOS 7D13v13

This BIOS supports Resize Bar
 
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