MSI & ASRock Roll Back AMD AGESA 1.0.0.4 BIOS Firmware As It Disables Cores on Ryzen CPUs

In the last few weeks, AMD Ryzen CPU owners have been facing some difficulty with their processors. In recent BIOS firmware updates from MSI and ASRock, AMD’s AGESA 1.0.0.4 has caused some Ryzen CPUs to suffer from disabled cores. MSI and ASRock have rolled back the update and reverted back to previous BIOS firmware versions as a solution to this issue.

The affected users have reported that their CPUs were having trouble booting their systems and were suffering from mysterious increases in their temperature and reduction in their clock speeds. After further investigation, it was revealed that the issue was due to AMD’s AGESA 1.0.0.4 update. This update was supposedly intended to improve the speed of certain memory operations on the Ryzen CPU, but instead had the unintended consequence of disabling some cores on certain CPUs.

After the issue was reported, MSI and ASRock quickly took action, releasing fixes that reverted their BIOS firmware back to previous versions. This issue did not affect all users, as only select users were running the updated BIOS firmware that included AGESA 1.0.0.4. For those affected, MSI and ASRock have released BIOS updates that have reverted the firmware to previous versions.

It is still unclear why AGESA 1.0.0.4 was causing the issue with some Ryzen CPUs. AMD has yet to provide any official explanation for this issue, but many users have speculated that the update could be related to the Ryzen CPUs’ new “Zen 3” architecture.

At this point, it is unclear if AMD will release any fixes for AGESA 1.0.0.4, but for now MSI and ASRock have taken the initiative to roll back the update. This should help affected users get back to using their Ryzen CPUs without any issues. As this issue is not affecting all users, AMD continues to recommend that consumers use the latest BIOS versions for their Ryzen CPUs.