If a standard connection fails, you may need a specific Download Agent (DA) or custom loader file for newer "secure boot" devices.
With the phone powered off, connect it to the PC via USB. nck dongle android mtk 26 5 download top
You cannot interface with a MediaTek chip in bootloader or BROM mode without proper drivers. Download and install: : Crucial for Meta and Download modes. If a standard connection fails, you may need