If you have tried all the steps above and still get the handshaking error, your device might require a different approach:
Windows often blocks unsigned third-party drivers required for low-level device flashing. Disabling this security feature is frequently mandatory. mtk bypass tool handshaking error fix
Once the tool detects the device ("Preloader/BROM mode"), release the buttons. If you have tried all the steps above
Windows USB stack has inherent latency (1-2ms) that can break MTK handshake. Linux has sub-millisecond response. mtk bypass tool handshaking error fix