How to Boot to an External Device Using USB Type-C Connection

Summary: BIOS settings to select to boot to an external device using USB TYPE-C connection for XPS, Precision, and Latitude laptops.

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Symptoms

XPS, Precision, and Latitude may not be able to boot to externally connected USB Type-C devices. The computer may report a "Device not identified" error.

Cause

The default specification bypasses the USB boot sequence to reduce the boot times in the default configuration. Due to this default configuration, the computer does not boot to the external device.

Resolution

Enable below two options to support boot from an external device.

  1. At boot, Press the F2 key or alternately press the F12 key then select the option to enter the BIOS setup.
  2. In POST Behavior, select Fastboot then select the Thorough option.
    In POST Behavior, select Fastboot then select the Thorough option.  
  3. In System Configuration, select USB/Thunderbolt Configuration, then select Enable Thunderbolt Boot Support.
    In System Configuration, select USB/Thunderbolt Configuration, then select Enable Thunderbolt Boot Support. 
    Note: Check to Enable USB Boot Support to recognize the USB boot device.
  4. In the General Tab, select Advanced Boot Configuration, then check Enable Legacy Option ROMs and Enable UEFI Network Stack if not already checked.
    In the General Tab, select Advanced Boot Configuration, then check Enable Legacy Option ROMs and Enable UEFI Network Stack if not already checked. 
  5. Reboot the computer, the USB Type-C device should now appear in the boot options.

See these Dell Knowledge Base articles for related information:

Affected Products

Latitude 7275, Precision 3520, Precision 5520, Precision 3510, Precision 5510, XPS 12 9250
Article Properties
Article Number: 000131221
Article Type: Solution
Last Modified: 20 Apr 2026
Version:  13
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