Mtk preloader usb vcom port driver: What is it and why do you need it?

How the mobile phone (that is off, but had been just plugged into USB) informs the Windows PC (with installed drivers "MediaTek PreLoader USB VCOM port" and "MediaTek USB Port") how to identify itself: as device - "MediaTek PreLoader USB VCOM port" or as - "MediaTek USB Port"?

Mtk preloader usb vcom port driver

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When you plug in a MediaTek phone, it will turn on, but not fully on. The boot ROM will run, which will run the preloader, and depending on implementation, either show the charging animation or starts the Linux kernel and enters into a mode called kernel power-off charging (KPOC) that shows the charging animation. The devices you're seeing are associated with the first two stages. Both devices are used for downloading firmware to the phone, but they represent different stages and support different command sets. MediaTek USB Port is created by the boot ROM, and MediaTek PreLoader USB VCOM port is created by the preloader (it runs after the boot ROM and does further hardware initialization).

How the mobile phone (that is off) informs the Windows PC (with installed drivers "MediaTek PreLoader USB VCOM port" and "MediaTek USB Port") how to identify itself: as device - "MediaTek PreLoader USB VCOM port" or as- "MediaTek USB Port"? 2ff7e9595c