This guide explains how to update your CyberPower-branded "ASRock B450m Gaming" motherboard to the official ASRock B450M/ac BIOS for that board. This process nukes the CyberPower logo, adds NVME support, CPU support and the other ASRock features.

Here are the files I used, original credits to this reddit comment, I mostly made this for visibility/documentation

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Steps

1. Download the latest BIOS

   • Get the latest BIOS from ASRock’s support page, as of writing the last stable release is: B450Mac(3.10)ROM.zip
   • Unzip the archive; you should have a file named B45MAC3.10.

2. Download Flashtools

   • Download from here.
   • Extract the files. The package includes the portable Rufus app.

3. Create a FreeDOS Bootable USB

   • Use Rufus to make a bootable USB drive with FreeDOS.

4. Copy Required Files to USB

   • Copy flashrom.exe and CWSDPMI.EXE from the Flashtools package.
   • Copy the BIOS ROM file (B45MAC3.10).

5. Boot from the USB Drive

   • Reboot your PC and boot into the USB drive.
   • FreeDOS should load.

6. Backup Current BIOS (Important!)

   • Before flashing, always make a backup:

     flashrom -p internal -r BACKUP.ROM

   • Store this file safely in case you need to restore.

7. Flash the New BIOS

   • Write the new BIOS:

     flashrom -p internal -w B45MAC3.10

   • Replace B45MAC3.10 with your actual BIOS filename if different.