Find (or Build Number) and tap it 7 times until you see "You are now a developer!".
To communicate with your phone via a PC, it must be in Fastboot mode. Power off the device completely. Press and hold the buttons simultaneously until the Vivo logo appears. Use the volume keys to select Fastboot Mode and confirm with the Power button. Step 3: Unofficial Unlock Commands unlock bootloader vivo y71 high quality
A: You can lock the bootloader on Vivo Y71 by using the fastboot oem lock command. However, this process may not be reversible, and your device may not be restored to its original state. Find (or Build Number) and tap it 7