Lenovo ThinkPad X1 Yoga User Manual page 92

To define a Network Boot sequence, do the following:
1. Restart the computer. When the logo screen is displayed, press F1 to start the ThinkPad Setup program.
2. Select Startup ➙ Network Boot. The boot device list is displayed.
3. Select a boot device to make it as the top boot priority.
4. Press F10 to save the settings and exit.
You can press F9 to restore to the factory default settings.
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