Whether you are looking to install a custom recovery or simply need to exit a boot loop, here is the complete guide on how to open Fastboot Mode on a VIVO Y12. Prerequisites Before Starting
Before learning how to open it, you must understand what it is. Fastboot is a diagnostic and engineering protocol included with Android SDK tools. Unlike Recovery Mode (which deals with updates and resets), Fastboot allows you to modify the actual partitions of your phone's internal storage (boot, system, recovery) while the phone is connected to a PC via USB.
If the ADB command fails, ensure you have installed the correct VIVO USB Drivers on your Windows or Mac computer.
You are now in Fastboot Mode. The screen will display "Fastboot Mode..." text, and in some versions of Funtouch OS, you may see options to "Reboot" or "Switch to Recovery."