If your Cosmos Laser 4K or 1080p projector has a volume issue, for example, you can't adjust the volume or the volume is too low, please try these steps:

1. Update the firmware of the 4K dongle and Cosmos Laser to the latest version:

4K Dongle: Press the settings button on the remote and go to Settings > Device Preferences > About > System Update.

Cosmos Laser Projector: Press the settings button on the remote and go to Settings > Device Preferences > About > Projector Firmware Update.

2. Follow the steps in the link to reset the remote. After that, the volume bar will show on the right side of the screen.

If this issue persists, please contact us with a short video showing the issue. If possible, include the volume bar. Make sure to mention that you have tried the steps listed above, so our agents do not ask you to repeat these steps.