Use the live SINR (Signal-to-Interference-plus-Noise Ratio) graph to rotate your router or external antenna. Aim for the highest SINR possible for the fastest speeds.
| Symptom | Root Cause | Solution | | :--- | :--- | :--- | | "Port not found" | Windows installed the MTP (Media) driver only. | Use Zadig to force install usbser.sys driver on the interface with VID 12d1. | | Values show but don't change | Modem is in power save mode (PSM). | Send AT+CPSMS=0 via terminal to disable deep sleep. | | HMonitor crashes on start | Missing Visual C++ Redistributable. | Install VC++ 2015-2022 x86/x64 from Microsoft. | | "Unknown response" in log | Modem uses proprietary rather than standard AT set. | Try "Quectel" mode in settings; HMonitor supports AT+QENG natively. | lte hmonitor install
: Ensure the folder is writable so the program can save its configuration. | Use Zadig to force install usbser
Run the application via terminal with the command: mono ./LTEHMonitor.exe . | | HMonitor crashes on start | Missing
: Ensure you have disabled "Two-Factor Authentication" or "Force Password Change" in the Huawei web interface, as these can block third-party app logins.