MSI - BIOS update issue

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mallfunctio15c802eb

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Motherboard: MSI B450M PRO-M2 MAX (MS-7B84)
Current BIOS version: E7B84AMT.AP3
Build date: 04/23/2020
CPU: AMD Ryzen 5 3600

I am trying to update the BIOS using M-Flash, but the BIOS update file is not recognized.
I downloaded the retail BIOS from the MSI support page for the B450M PRO-M2 MAX, extracted the ZIP file, and copied the BIOS file to the root of a FAT32 USB drive.
M-Flash detects the USB drive itself (“Generic Flash Disk 8.07”), but it does not show any BIOS files.
I noticed my installed BIOS uses “AMT”:
E7B84AMT.AP3
while the MSI retail BIOS files are named:
E7B84AMS.xxx
Does this mean my board is using an OEM/custom BIOS branch?
If so, is there a compatible BIOS update available for the AMT version? Or can the retail AMS BIOS safely be flashed another way?
Or is this motherboard tied to a system integrator/prebuilt vendor firmware?
Additional symptoms:
- Windows 11 installation repeatedly freezes around 50%
TPM/fTPM was initially unavailable until BIOS defaults were loaded and one RAM stick removed
BIOS itself otherwise appears functional and detects CPU, RAM, SSD, and USB devices normally

Any guidance would be appreciated.
 
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Did you buy this board used, or as part of a pre-built PC? As mentioned, it uses a custom BIOS. They often sell these boards for cheap on eBay etc., because now you have to jump through hoops to update the BIOS.

M-FLASH will not see an update file with a non-matching filename. Everything before the dot, and the first character after, have to match with your installed BIOS. Don't bother trying to rename the file, even if M-FLASH shows it afterwards, it will still not flash it as it realizes it's not matching.

You have two options if you want to update it: You can ask Alan J T to send you a newer custom version, see here. But I don't know how current that version is. If it's pretty current (I mean, yours is ancient), then this is probably the easiest way.

Or, if Alan's version is also not that current, then it's worth thinking about "cross-flashing" the board to the retail board's BIOS, using this flash tool. At your own risk of course, but I've not yet seen a board being bricked from this.
 
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I actually bought it used, so that explains a lot now. I did not realize it was using a custom OEM BIOS until I tried updating it.
The system is currently booting and running Windows with the Ryzen 9 5900XT, so for now I’m trying to avoid cross-flashing unless necessary while I troubleshoot the remaining chipset/network driver issues. / Thanks.
 
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Ok. Then ask Alan J T for a newer BIOS version of that custom one, yours is really old and probably still full of bugs. No use troubleshooting things too much when everything would run smoothly on a newer BIOS version...
 
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