If you find that manual keystone correction isn't working properly on Cosmos Laser, try the following options:

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

- Press the Settings button on the remote and select Settings > Device Preferences > About > System Update.

- Press the Settings button on the remote and select Settings > Device Preferences > About > Projector Firmware Update.

2. Press the Settings button on the projector or the Source button on the remote, select Image Correction, and turn off Auto Screen Fit.

If you still have any questions or concerns regarding the manual keystone correction, contact us for further assistance.