This often happens after a failed software update or a "cross-flash" (installing firmware from a different region, like flashing Korean firmware on a Sprint model).
This paper outlines the technical methodology for accessing and restoring the baseband configuration (NV items) on the LG V50 ThinQ. Due to the device's partition structure and security protocols (Qualcomm Secure Boot), IMEI repair is significantly more complex than on previous LG legacy devices (such as the V20 or G6). This document explores the required modes, necessary drivers, and the interaction between the primary and secondary displays regarding firmware flashing. lg v50 imei repair