The first place to check would be Toshiba's official support website. Although Toshiba's support page might redirect you to other resources due to the company's current status, you can search for "Toshiba Satellite C660 drivers" or similar keywords.
ACPI\TOS6205 is a specific hardware identifier for the Bluetooth controller interface found in several legacy Toshiba laptops, including the Satellite C660 series Bluetooth Acpi Tos6205 Toshiba Satellite C660 Zip
This is a standard for device configuration and power management in computers. ACPI drivers help the operating system manage power and configure hardware components. For Bluetooth, ACPI drivers ensure that the Bluetooth adapter is properly recognized and managed by the operating system. The first place to check would be Toshiba's
The second component of the query, , is the true antagonist. The Satellite C660’s BIOS, last updated around 2011, was written for Windows 7. It uses ACPI methods that are not fully compliant with the stricter power management paradigms of Windows 8.1 and 10. Specifically, the _PRW (Power Resources for Wake) method for the TOS6205 device may return incorrect values, causing the OS to think the device is permanently in a D3 (off) power state. Consequently, even installing the correct Toshiba Bluetooth stack fails because the driver cannot command the ACPI firmware to power up the radio. This is why generic Bluetooth drivers from Microsoft or Intel do not work—they lack the proprietary ACPI control logic that the TOS6205 requires. ACPI drivers help the operating system manage power
Tech Retrospective & Hardware Debug Lab Reading Time: 6 minutes