: If the device appears with a yellow exclamation mark and says "A protocol error was detected," ensure your BIOS is updated to the latest version, as older firmware may have bugs in its TPM implementation.
: To function on Windows 7, your system must be running in UEFI mode . Acpi Msft0101 Driver Windows 7
: After installation, the "Unknown Device" should be recognized as "Trusted Platform Module 2.0" under the Security devices category in Device Manager. Alternative Solution: Disable in BIOS : If the device appears with a yellow
: Locate the KB2920188 update. While Microsoft has retired some direct hotfix links, you can often find it archived on manufacturer support sites like the HP Community . Acpi Msft0101 Driver Windows 7