This command will show the raw model string your phone is sending.
Incompatible LGUP Version: Older versions of LGUP do not support newer models like the LG V60, Wing, or Velvet without specific patches. How to Fix the LGUP Model Unknown Error lgup model unknown
USB 2.0 vs 3.0: LG's Download Mode is notoriously finicky with USB 3.0 or 3.1 ports (blue or red ports). Try using a USB 2.0 port (black) on the back of your motherboard if you are using a desktop. This command will show the raw model string
This error stops you dead in your tracks. You cannot proceed with any flashing operation. lgup model unknown
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