This is usually due to driver conflicts. Use a tool like "USBDeview" to clear old drivers and reinstall the MTK VCOM package.
This paper provides a technical overview of the MTK IMEI V30 command protocol utilized in the calibration and servicing of MediaTek (MTK) based mobile hardware. As mobile device complexity increases, the mechanisms for writing and verifying persistent identifiers such as the International Mobile Equipment Identity (IMEI) have evolved from legacy AT-command structures to proprietary, encrypted protocols. This document analyzes the V30 command structure, payload formatting, handshake requirements, and error-handling mechanisms inherent to the MediaTek driver stack. mtk imei v30 top