The BCM2045A0 is a reliable Bluetooth chipset, but it requires manual intervention to work on Windows 11. The method (Method 1) usually resolves the issue faster than waiting for Windows Update.
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If the automatic methods fail, you can source the original OEM drivers based on your device manufacturer: The BCM2045A0 is a reliable Bluetooth chipset, but
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If Windows Update fails to find the driver, you can force it to look for a compatible driver using the Hardware ID. bcm2045a0 driver windows 11