: Search for "Mi OSD" or "Mi Service Station" on the Chinese Xiaomi Support site (using a browser translator).

The ACPI protocol acts as the bridge between your operating system and your motherboard's firmware (BIOS) to manage power states and hardware discovery. When a device like appears with a yellow exclamation mark, it usually means:

If you find a constant error (e.g., Return (0x0) in _STA ), that explains why Windows cannot start the device.

The ACPI handles communication between the OS and the hardware. If your chipset drivers are outdated, Windows might fail to recognize sub-components like the WSTADEF device.

: Under the "Details" tab of a device's properties (listed as Device Instance Path ).

The system is off, and no context is saved. The next boot will start from a cold boot state.