Latest Bios for your MB is 7C02v1E. there is a beta version 7C02v1H5 however at this stage don't use that.
To update the Bios download from here: https://www.msi.com/Motherboard/support/B450-TOMAHAWK#down-bios

Power down the system and just have power to the MB.

You have flashback on your rear I/O panel so rename the file to MSI.ROM and transfer to a USB that is formatted to FAT32 single partition and insert it to the correct USB port as per your manual (page 22) then press the flashback button.
It will take a minute or two and when it stops flashing your done.
 
May 11, 2021
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Latest Bios for your MB is 7C02v1E. there is a beta version 7C02v1H5 however at this stage don't use that.
To update the Bios download from here: https://www.msi.com/Motherboard/support/B450-TOMAHAWK#down-bios

Power down the system and just have power to the MB.

You have flashback on your rear I/O panel so rename the file to MSI.ROM and transfer to a USB that is formatted to FAT32 single partition and insert it to the correct USB port as per your manual (page 22) then press the flashback button.
It will take a minute or two and when it stops flashing your done.
Recently just updated the BIOS, still doesn't work....
 

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