: Go to Settings > About phone and tap Software version seven times.

Specifically designed to execute the unlock command while the phone is in Fastboot mode. Before You Begin: Critical Prerequisites

: Obtain the official ADB and Fastboot binaries from XDA-Developers .

Use the tool's "ADB To Fastboot" feature to reboot the phone into the bootloader environment.

Using a "Fix Tool" to unlock the bootloader of the Vivo V20 has significant downsides: