MPG B550 GAMING PLUS wil not show files i M-Flash

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bjorn.lervi157802d6

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I have a 1 GB usb-stick and a 16 GB usb-stick. Fat32 formatted (mbr) in Windows and in Rufus. I have downloaded the latest bios update (and several older ones too). If I make a folder the folder shows (deleted that one too). The files I put on det root of the USB is like this: E7C56AMS.150 (for the 1.5 update) but this one (and older and newer) will not show. The bios is the original from when the machine was new.
 

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You have a board that was used in a pre-built PC, with a custom BIOS. M-Flash will not show the BIOS update file of the retail board, because your current BIOS naming scheme will not match the BIOS updates for the retail board. M-FLASH will simply not show an update file with a non-matching filename. Everything before the dot, and the first character after, have to match with your installed BIOS (after "BIOS Ver.:" in the BIOS screen). 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.

It's possible to flash the official MSI BIOS using this flash tool. Same as here, https://forum-en.msi.com/index.php?threads/help-with-system-bios.414842/
 
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I tried the tool. It let me update the bios but afterward it will not start (at least it will not show anything on the screen). And the delete button does not work for getting into the bios. Any suggestions?
 

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Check the EZ Debug LEDs on the board, let's see which LED is on, that will give a hint.

Which BIOS did you flash, 7C56v1L for the retail B550 GAMING PLUS?
 
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I have been doing so much with he the usb-drive lately. So I managed to have both the 7C56v1L and the 7C56v10 on the usb-drive. And it picked the oldest one. I am not by the machine today but I will read the EZ debug Leds tomorrow. Thank you.
 

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That's a problem. You should have never had the v10 BIOS version on the USB drive, because in that, your 5600X CPU was not supported yet. Support only came with BIOS v17 and newer. But I would probably recommend 7C56v1B as the oldest version anyone should try for any issue. There is no need to ever try anything older, because the AGESA ComboAm4v2PI 1.2.0.7 was a known good version.

And if you want to cross-flash, then there's no need to start from an old version either, you go right to the latest version 7C56v1L. But of course, it was a mistake, things can happen, I don't blame you.

Right now, if you accidentally flashed BIOS v10, then you have a slight problem, in that only Ryzen 3000-series CPUs are able to boot with that. However, you are in luck, as this board has the Flash BIOS Button. And since you flashed the retail BIOS, you can now hopefully use the button to flash the 7C56v1L BIOS., like so:

1. Download the latest BIOS from the MSI support site for your board and extract it.
2. Take a USB stick and format it to FAT32 (it's best for it to have a size of 32 GB or less). You can also try Rufus for formatting, as FAT32 non-bootable.
3. Rename the extracted (!) BIOS file to MSI.ROM and save it to the root of your USB flash drive / USB stick (not in a subfolder).
4. Plug the USB flash drive / USB stick that contains the MSI.ROM file into the marked Flash BIOS Port (!) on the rear I/O panel.
5. With the PC off, press the Flash BIOS Button, and the LED should start flashing for about 5-8 minutes and then the board reboots.

Anything drastically different (under a minute of flashing, or over 10 minutes of flashing) and the flashing didn't work, so you can abort and try with a different USB stick (sometimes the board can be very picky as to which USB drive it will accept). After ten minutes it will never finish.
 
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Sorry to bother you with all this.
The EZ Debug LED are black. No sign of life.

I tried the Flash bios port av the flash bios button. It blinks for 10 seconds. The fan and lights on the ram turns on but turns off almost immediately. The blinking stops. I tried both version 7C56v1L and 7C56v1B. Renamed the unpacked file til MSI.ROM Formated in Rufus and in Windows. Tied three different usb-sticks 1 GB, 16 GB and 32 GB).

I tried with nothing on the usb-stick (one with a light). It seems like it recognised that there was nothing on it (blinking for 10 seconds) but did not start up the fan an the lights on the ram. So it seems like the motherboard are not happy with the MSI.ROM files I am putting on the usb-stick.
 
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Removed the cmos-battery and left it out for 1 min. Bios update still not working via the bios usb slot.
But the EZ debug LED changed... (VGA and CPU).
Edit: But after an other restart only Boot light is on again.
1780661743243.png
 
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Normally, with the BOOT LED, you would be in the BIOS. What graphics card do you use? Can you try all its graphics ports?

But if you really have the v10 BIOS on there now, then I don't trust the BOOT LED, because without support for 5000-series, it shouldn't even reach the BIOS. So the main priority has to be to get a successful flash to the latest BIOS version. The best method for that is to source more different USB sticks, in hopes that one is accepted.

Because the alternative for when you can't get it flashed to a current BIOS version would be to borrow a Ryzen 3000-series CPU, which would be supported even by the first BIOS version. Then you can hopefully enter the BIOS, enter M-Flash, and flash 7C56v1L, so afterwards you can use your 5000-series and have everything sorted.
 
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