If your onboard Bluetooth card has failed, the cheapest and easiest solution is to buy a USB Bluetooth Dongle . They are inexpensive (usually $10–$20) and plug right into a USB port, instantly restoring Bluetooth functionality without needing to replace your motherboard.
If you have tried all the software fixes above and the Bluetooth category is still completely missing from Device Manager (even after selecting "Show hidden devices"), you may be dealing with a hardware failure. missing bluetooth toggle windows 11