Windows 10 prioritizes newer Bluetooth stacks (4.0+). The K53S typically uses Bluetooth 3.0 or 2.1 modules. Microsoft’s generic inbox driver does not support the specific hardware IDs of these legacy modules.
After reboot, the Bluetooth should appear correctly, and the toggle in Windows 10 Settings will function. asus k53s bluetooth driver windows 10
I can then provide a for the exact driver you need. How to fix Bluetooth Connection Problems | ASUS SUPPORT Windows 10 prioritizes newer Bluetooth stacks (4