The D (cost-reduced), A (standard), and S (secure) variants all use the same USB VCOM driver. However, the S variant may require an auth_sv5.auth file in SP Flash Tool.
MTK_USB_Driver_Auto_Installer_v1.0.8.zip (or higher)
Before installing drivers, you must understand how the MT6261 communicates with a PC. The chipset uses two distinct USB modes:
