For those who need PXE boot on Dell laptops like the 7390 2-in-1 that works. I had to restore from an online backup due to the latest OS-killing patch for Windows 10. Without this I couldn't boot the PXE image to start the recovery. I have a generic USB-C hub with a 1GB network adapter and it doesn't work for PXE boot. FYI, you need to change some settings in the BIOS to get the PXE boot menu to appear at boot.
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