What to do if there are dark spots on the image of the Xiaomi Smart Projector L1?

If there are dark spots on the image of the Xiaomi Smart Projector L1, please refer to the following details:
1. Please determine whether there are dark spots on all of the pages. If it only occurs on some of the pages, it will be the page problems;
2. If there are dark spots on all of the pages, confirm the position and size, and please change the projection environment, such as moving the projection position, and checking whether the dark spots move with the projector to ensure it is not caused by environmental problems;
3. If the above methods are useless, please contact the local-after sales service center.