If successful, you’ll see [Unlocked] seccfg partition . This disables the bootloader lock flag.
Unlike Xiaomi or OnePlus, Vivo does provide an official bootloader unlock tool for most of its devices, including the Y71. Vivo locks bootloaders tightly to prevent unauthorized modifications. unlock bootloader vivo y71 high quality
: You must have a PC with ADB and Fastboot drivers installed, a high-quality USB data cable, and a minimum 60% battery charge on your device. Step 1: Preparing the Device If successful, you’ll see [Unlocked] seccfg partition