How to fix Un-allowed DMA capable bus/device(s) detected?

Question

Hi All,

I have found that I can't enable Windows Device Encryption on my desktop due to the following issue "Un-allowed DMA-capable bus/device(s) detected". I have tried the registry solution that was given here: (https://learn.microsoft.com/en-us/windows-hardware/design/device-experiences/oem-bitlocker#un-allowed-dma-capable-busdevices-detected) but it still won't work for me.

Answer 1

Hi there,

You need to Check if there are BIOS/UEFI updates available for your system.

also

You need to

Suspend BitLocker (required for devices bound to PCR[07] only if the firmware update changes the Secure Boot policy)

Apply the update

Restart the device

Resume BitLocker

check this article :

https://learn.microsoft.com/en-us/windows-hardware/design/device-experiences/oem-bitlocker#un-allowed-dma-capable-busdevices-detected

And see if it helps,

Thank you

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