Again in 2023, Neowin reported on TPM attestation failures on AMD Ryzen PCs that had been recognized since December 2022 however had been nonetheless round on the time, even a number of months later. We got here to know of the bug after a few of our discussion board members alerted us.

On the problem notes, Microsoft wrote, “TPM attestation for AMD platforms with ASP firmware TPM would possibly fail with error code 0x80070490 on Home windows methods. This concern is resolved on later variations of AMD firmware. Seek the advice of with machine producers and firmware launch notes for which firmware variations include the replace.”

So whereas Microsoft acknowledged {that a} future (post-2022) AMD firmware had supposedly already resolved the problem, we had been a bit stunned to see that the problem nonetheless endured, and as such, principally blamed AMD for the issue.

Nevertheless, it seems we weren’t fairly proper in doing so. Whereas searching, Neowin noticed a brand new help article at present concerning the TPM attestation failure that’s nonetheless in all probability occurring, AMD has clarified that the corporate had launched the firmware patch already in 2022 however a few of the motherboard distributors didn’t launch that replace for customers.

The problem impacts Ryzen 1000 (Zen1) as much as Ryzen 5000 (Zen 3) processors, so it primarily impacts AM4 motherboards. AMD additional clarifies that “motherboards with AMD fTPM 3.*.0” are affected. If you’re undecided the corporate says:

Run “Powershell.exe -Command Get-TPM” to find out if the system is impacted by this concern.

The corporate has defined the state of affairs and its implications and the way it can lead methods into BitLocker restoration:

AMD resolved this concern in TPM firmware updates offered to motherboard producers in 2022.

• Some motherboard producers selected to not redistribute these TPM firmware updates.
• BitLocker™ customers can droop BitLocker™ throughout these TPM firmware updates, which can clear the TPM exterior the Home windows® API. If customers don’t droop BitLocker™, the pc could enter restoration mode when restarting and will require a restoration key or password to entry the pc.

We aren’t certain why the board makers selected not to take action, maybe they seen some main concern elsewhere; and so AMD now recommends contacting your board’s producer instantly if you’re nonetheless having TPM attestation failures and associated BitLocker points or encountering different issues. For instance, AMD notes that avid gamers could also be unable to compete in on-line money tournaments.

The corporate writes:

Contact your motherboard producer’s customer support division to find out if a firmware replace is offered.

BitLocker lockout generally is a large drawback if you’re not cautious and so it’s endorsed that you simply bookmark this official information from Microsoft. Yow will discover the help article concerning TPM attestation right here on AMD’s official web site.