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Troubleshooting Legacy Boot Device Not Found

Fix the Legacy Boot Device Not Found error that stops your Universal Robots cobot from starting up. Also covers no option to boot to, and a robot that will not start. Usually caused by a USB drive left plugged in, or a loose SD card in the cabinet.

Written by Doug Ayers

If your robot shows Legacy Boot Device Not Found when you turn it on, this article will help you fix it.

What You'll See

You may see one of these messages on the teach pendant when you turn the robot on:

  • Legacy Boot Device Not Found

  • No Option To Boot To

You may also notice:

  • Turning the robot on the robot does not reach the teach pendant home screen.

  • Turning the robot off and on again only sometimes fixes the issue.

Quick Fix

Unplug any USB drive from the teach pendant and from the robot's cabinet. Then restart the robot. The robot should start up and reach the teach pendant home screen.

With a USB drive plugged in, the robot may try to start from the drive instead of its own storage.

If That Didn't Work

Re-seat the SD Card in the Robot's Cabinet

The SD card in the robot's cabinet works as the robot's hard drive and memory. A card that has worked loose can cause this error.

Important

Turn the robot all the way off and unplug it before you open the robot's cabinet. Removing the SD card while the robot has power can damage the card.

  1. Power off the robot.
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  2. Unplug the main power cable from the robot's cabinet.
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  3. Press and hold the power button on the teach pendant for 5 seconds.

    This drains the remaining power from the robot and its cabinet.
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  4. Open the robot's cabinet.
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  5. Find the Do Not Remove label above the SD card slot.
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    Inside the robot's cabinet, showing the Do Not Remove label above the SD card slot

  6. Press the SD card in gently, then release it.

    The card pops out.
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  7. Push the SD card back in until it clicks into place.
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  8. Close the cabinet. Plug the main power cable back in. Then power on the robot.

    The robot starts up and reaches the teach pendant home screen.
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  9. Initialize the robot arm.

If the Error Keeps Coming Back

If re-seating the SD card clears the error and it returns later, the card may be damaged. We can send you a replacement SD card.

Still Need Help?

Tap the Support menu in Beacon to send us a message. It helps if you can share:

  • A photo of any error messages on the teach pendant or equipment

  • Your robot's serial number (printed on a label on the robot's base)

  • How often you see the message, and whether it happens every time you turn the robot on

  • Whether re-seating the SD card fixed it, and how long it stayed fixed

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