Question I am installing Windows 10 on C9Z890-MW, the Device Manager is showing an exclamation mark of the device " UCM-UCSId ACPI". How can I fix this issue? Answer As the C9Z890-MW motherboard supports USCI 2.0, but the Windows 10 OS does not support it. Starting in Windows 11, version 22H2 September Update, it supports USCI 2.0.  We recommend using WIN 11_22H2 or a later version, the exclamation mark of the device " UCM-UCSI ACPI" does not appear.  The same issue also appeared on C9B860-MW and C9Q870-M motherboards. For more Microsoft’s public information about UCM-UCSI ACPI Device, please reference the Topic “USB” in the following link: https://learn.microsoft.com/en-us/windows-hardware/drivers/driver-changes-for-windows-11-version-23h2 Was this FAQ helpful? YES      NO Enter Comments Below: Note: Your comments/feedback should be limited to this FAQ only. For technical support, please send an email to support@supermicro.com.  Enter your email address below if you'd like technical support staff to reply:  Please type the Captcha (no space) D K Y C FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 41959 N/A 01/15/25     Print Answer