I tested this file on 3 Redmi 6 units:
The preloader is the for MediaTek devices. It is the very first piece of code that executes when you press the power button. redmi 6 preloader file
If your device is locked, run the . Click "Bypass" and connect your phone via USB while holding Volume Down + Power. I tested this file on 3 Redmi 6
It prepares the device to receive firmware. When the phone is powered off and connected via USB (sometimes while holding volume buttons), the preloader triggers Preloader Mode port communication. redmi 6 preloader file