| Cause | Explanation | |-------|-------------| | | The proper USB-to-COM drivers (e.g., MediaTek USB Port, Qualcomm HS-USB) are not installed or are outdated. | | Wrong device mode | The device is not in Meta Mode, Download Mode, or Factory Mode. It may be booting normally instead. | | Faulty USB cable/port | A damaged cable or unstable connection disrupts communication. | | Port conflict | Another program is already using the COM port (e.g., modem dial-up software, serial debuggers). | | Disabled or unsigned driver enforcement | On Windows, driver signature enforcement may block necessary drivers. | | Power management | USB selective suspend may cut power to the port mid-handshake. |
Most people click "Download" in the tool before connecting the phone. Wrong order. it cannot find the meta usb com port for modem handshake
Some tools specifically require "CDC Drivers" to bridge the COM port. Signature Enforcement: On Windows 10 or 11, you | Cause | Explanation | |-------|-------------| | |