On Windows, you must install the stock MTK port drivers and the USBDK driver to allow the tool to communicate with the phone in BROM mode.

Built on a Python framework, making it cross-platform (Windows/Linux) and highly customizable for developers. Technical Workflow

MTK Client v5.5 is an unofficial utility designed for repairing, flashing, and unlocking Android devices powered by MediaTek (MTK) chipsets

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: You must install the USBDK driver and standard MediaTek VCOM ports for Windows.