You are most likely to see the error when using Internet Explorer (IE) , 360 Browser (in compatibility mode) , or any browser trying to access a Chinese government tax website like those for Shanghai, Guangdong, or Shenzhen's electronic tax bureaus.
If you are using this tool for "Download Mode" recovery (unbricking): please install csmg b2c client tool
Are you trying to a specific LG model, or are you just looking to update your software? You are most likely to see the error
Here’s a complete, structured review of the statement/request: 360 Browser (in compatibility mode)