If you have a specific issue (e.g., “checking for updates” stuck or a custom ROM), let me know and I can help troubleshoot.
The LG G3 reached its official "end of life" (EOL) several years ago. While LG has historically supported its devices with over-the-air (OTA) updates, the company officially announced the permanent shutdown of its mobile update servers and the LG Bridge tool on . lg g3 update us cellular