The most common cause. MediaTek devices require specific drivers:
This is a specific and technical issue. When you say you for a modem handshake, you’re likely working with a Qualcomm-based device (often in embedded systems, routers, or mobile broadband modems) where the “Meta” mode is a low-level diagnostic mode (sometimes called Meta Mode , Qualcomm Diagnostics Mode , or QCDM ). The COM port is essential for sending AT commands, NV item reads/writes, or performing a handshake for firmware recovery or IMEI repair. it cannot find the meta usb com port for modem handshake
Windows often blocks the unsigned drivers required for META mode. The most common cause
If you are reading this, you have likely encountered a small red error window in the middle of a high-stakes operation—perhaps you were trying to flash a custom ROM, unbrick a smartphone, or restore an IMEI using tools like SP Flash Tool, Miracle Box, or Octoplus Box. The error message reads: The COM port is essential for sending AT