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What to Do If Your ROCK Ultra .epr LiDAR File Is Only 5 KB

ROCK Ultra .epr File Is Only 5 KB – Causes and Fixes

 

If you complete a full mission with your ROCK Ultra and find that the raw LiDAR file (.epr) in the LiDAR1 folder is only ~5 KB, the system initialized but never started firing the laser.

There are two common causes:

  • Incorrect LiDAR input voltage

  • LiDAR Protection preventing low-altitude or static capture

1. Verify LiDAR Voltage Settings (Most Common Cause)

The ROCK Ultra is optimized for DJI M300 / M350 platforms.
If you are flying anything else, you must manually set the voltage.

This applies if you are flying:

  • DJI M400

  • Freefly platforms

  • Inspired Flight platforms

  • Any non-M300 / M350 drone

Required Setting

2. Check LiDAR Protection Status (Common During Ground Tests)

The ROCK Ultra includes LiDAR Protection to prevent firing close to the ground.

Default Behavior