Here is the proper, step-by-step content for installing the MTK (MediaTek) PreLoader USB VCOM driver. This driver is essential for flashing firmware, unlocking bootloaders, or reviving bricked MediaTek devices (SP Flash Tool, Miracle Box, etc.).
He selected it and hit Next. A warning flashed: "Windows can't verify the publisher of this driver software." how to install mtk driver mediatek preloader usb vcom
It stayed. It didn't vanish.
What is Mediatek Preloader USB VCOM?
He needed to force the association.