After the update, Windows 11 has no sound and the audio isn't working

Try this:

Open Device Manager, and make sure you've audio drivers installed and properly working.

If no audio driver is listed, you can visit your device manufacturer's website to download and install audio drivers for your system model.

If audio driver is present, you can try updating audio drivers to latest version.

Or if you've already updated them, try to roll back previous version to see if that works.

Also, run Playing Audio troubleshooter from Settings app > System > Troubleshoot > Other troubleshooters. Let us know what it reports back.

This is a known issue with recent Windows 11 updates, particularly version 24H2, where a one-time driver installation error can cause audio to stop working entirely. The good news is that it's almost always fixable.

Windows Update sometimes pushes a generic or corrupted audio driver that doesn't play nice with your laptop's actual hardware. The fix usually involves either rolling back that driver or reinstalling the correct one from your laptop manufacturer.

Please download and install the latest audio driver.