If there are bright or colorful lines on your Nebula Cosmos/ Cosmos Max, perform a factory reset via the following steps:

1. Press the Power button to turn on the projector.
2. Immediately press and hold the power button until the Android Recovery page appears.
3. Select "Wipe data / Factory reset."

If you continue to see bright or colorful lines in your projector display, please contact Nebula customer service. Please include a photo or short video showing the issue and mention that you have tried the recommended steps. This will help us find a solution for you much faster.