For FRP bypass, select the "FRP Reset" option under the appropriate chipset tab (Qualcomm/MTK).
: Ensure you have downloaded the correct .tgz Fastboot ROM for your specific device model. How to Use BMB Tool for Flashing free-mi-flash-bmbtool-v1-0-flash-adb-fastboot-working-100
: Turn off your phone, then hold the Volume Down + Power buttons until the Fastboot logo appears. For FRP bypass, select the "FRP Reset" option