Flashing B550 Tomahawk but no CPU detected

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I'm flashing the BIOS on my Tomahawk to make it compatible with my Ryzen 5700G but it is not detecting the CPU. I'll flash via the button on the back and the led will flash and my usb stick will show data being transferred, but when I turn on the CPU debug led will still be on.

When I flash the BIOS from usb it will end its cycle by turning the computer off and restarting. Is this normal? What could be going wrong here?
 

teletubby_po

To infinity and beyond.
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the flash BIOS button LED should keep flashing for abt 5 mins then go off. are you flashing to BIOS version after 7C91vA7.zip?
 

Alan J T

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I'm flashing the BIOS on my Tomahawk to make it compatible with my Ryzen 5700G but it is not detecting the CPU. I'll flash via the button on the back and the led will flash and my usb stick will show data being transferred, but when I turn on the CPU debug led will still be on.

When I flash the BIOS from usb it will end its cycle by turning the computer off and restarting. Is this normal? What could be going wrong here?
Some directions for you

I only use USB 3.0 drives of a known brand not mystery drives.

It appears that cheap mystery drives may be problematic.

FOR BIOS FLASHBACK

Following Directions are for windows based OS

Right Click on the Downloaded Bios Zip File, select properties if you see the message this file is blocked by windows tick the box to unblock and click OK.

When in windows File Explorer make sure that you select the View tab and Tick the box Show Hidden Files and File Name Extensions.

Extract the BIOS file from the Downloaded ZIP file Open the folder it was extracted to.

Right click on the BIOS file, select copy and then paste it into a USB drive Formatted to FAT32,

When in Windows File Explorer make sure that you select the View Tab and Tick the box Show Hidden Files and File Name Extension.

Now rename the BIOS file to MSI.ROM

There should be no other files or folders on the USB drive, just the BIOS file you have renamed to MSI.ROM

For more details see this post By Mattech


I always strip any partitions out of USB drives when I buy them, Delete the partition or Volume and then make a new simple volume and Format to FAT32 I do this with every USB drive I get as I detest the formatting and software on them done by the Manufacturers is more trouble than they are worth.



I Normally do this with Windows Disk Manager

FlashBack can be used on a fully assembled PC even if CPU is one of the new 5xxx series.

PC must be turned off for BIOS Flashback to be started do not turn on your PC the Bios Flashback will do it for you

If that Fails see directions below.

And watch this Video


OK turn off and PSU and remove the power cord. Carefully take the PC apart remove all the components from the case as well as the Motherboard Place on a cardboard box or insulated surface, and plug in the 24 pin and the CPU power plugs for the Motherboard. Do not plug in any other leads to the board.

Plug in and turn on the PSU

Wait about 2 minutes before next step just in case there is a power on and off cycle when you turn on the PSU

Plug the USB Drive in to the USB port just below the Bios Button,

Do not touch any Jumpers on the Motherboard

Push the FlashBack button and then release it,

About 5 seconds later a led just above the USB port will start to flash, after 15 seconds of so the speed of the flashing light will double this is the writing to the BIOS period.

Once done writing to the it will stop flashing and PSU will turn off

For 16MB BIOS it will take about 4 to 5 minutes, and flashing stops.

For 32MB BIOS it will take 6 to 7 minutes, and flashing stops.

People have said that it may turn back on if so just turn off and unplug the PSU.

And Bios should be flashed if just one of these steps does not happen it is a failed flash.

Just to check out if the MB even understands the drive itself Forum Member jukka.savilaaks found the following after testing
Wrong file format: (Ie. ExFAT, NTFS etc) the drive flashes, but no power to the motherboard.

Wrong file name: The USB drive led flashes few times, the flash LED flashes few times, but no power to the motherboard

Correct file format and name but other error: the USB LED flashes few times, The flash LED flashes few times, power turns on, USB flashes again few times, flash LED flashes two times and then turns on and stays on.

Successfull flash: same as above except flashing keeps on for several minutes, until the flash LED stays off
 
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