Should I calibrate the LIDAR on my Dreame L20 Ultra?

No, you don’t need to. The LIDAR sensor self-calibrates every time the robot starts cleaning, and there’s no manual calibration mode. Navigation issues are usually caused by dust on the sensor, a stuck bumper, or a blocked LIDAR tower — clean it with a dry cloth, check for obstructions, and restart the robot. If problems persist, run Quick Mapping from the app or let it do a full clean run. Contact Dreame support only if that fails, but manual calibration is never necessary.