I have an Asrock Fatality ab350 gaming k4. I recently updated to bios 5.70. After doing so I can not boot any vms with any hardware passthrough. I attempted to downgrade back to 4.70, which was working. However the instant flash will not accept the file. Anyone else having this issue?

Did you enable vt-d/amd-vi again after updating the bios?

Yes. I can boot vms. Just with no GPUs or other passthrough.

IOMMU groups can change with a BIOS update. Make sure you pass through the right devices. Also the core numberings can change.

I did see this and reassigned the devices. Pcie 127 is the error I get now.

You might have another issue a couple people already reporting. Newer BIOS revisions for AM4 on different boards have that issue. Reverting back to an older Bios version is the only fix currently.

 

 

If you search the forum there are a couple more posts about this topic.

My issue with that is the bios flash will not accept an older bios file.

Thats board/vendor specific. You might have to search the specific forums to find an answer how to flash an older BIOS version for your motherboard or contact AsRock support directly.

On 7/14/2019 at 8:01 AM, bastl said:

You might have another issue a couple people already reporting. Newer BIOS revisions for AM4 on different boards have that issue. Reverting back to an older Bios version is the only fix currently.

 

 

If you search the forum there are a couple more posts about this topic.

 

On 7/14/2019 at 8:04 AM, mrjrp15 said:

My issue with that is the bios flash will not accept an older bios file.

@mrjrp15 - @bastl already linked to it, there is a link to the [unofficial] ASUS downgrade utility in that topic:  Asus downgrade utility Afuefix64 from overclock.net   Downgrade to the last version that worked and let us know how it worked.

 

Edited July 16, 20196 yr by mattz

This was resolved by Asrock. They have a tool available via support.

 

Thanks for all the suggestions.

 

Helps when I am not the only one seeing these issues.

30 minutes ago, mrjrp15 said:

This was resolved by Asrock. They have a tool available via support.

 

Thanks for all the suggestions.

 

Helps when I am not the only one seeing these issues.

What tool are you referring to? Thanks, In advance.

Asrock has a Windows flash utility that will downgrade, while the in bios tool would not.