Don't bother calibrating the LIDAR on your Dreame L20 Ultra.

You don’t need to. The LIDAR sensor self-calibrates every time the robot starts cleaning. There’s no manual calibration mode in the app or on the vacuum itself.

If you’re having navigation issues — drifting, spinning, mapping wrong — it’s almost never a calibration problem. It’s usually dust on the sensor, a stuck bumper, or something blocking the LIDAR tower. Clean the sensor with a dry microfiber cloth. Make sure nothing is blocking the rotating tower. Restart the robot.

If you still get bad maps, run the “Quick Mapping” from the app (or let it do a full clean run). The robot will recalibrate on its own.

If none of that helps, contact Dreame support. But I’ve never heard of a case where a user needed to “calibrate” the LIDAR manually. It’s a sealed consumer product — not a piece of lab equipment.

You’re overthinking it.