If it returns unlocked: yes , you have succeeded.
Unlocking the bootloader voids your warranty, resets your device to factory settings (wipes all data), and may trigger permanent safety net failures (e.g., Google Pay, banking apps). Vivo does not officially provide unlock tools for the Y71. Proceed at your own risk. unlock bootloader vivo y71 high quality
Do you already have a specific downloaded? If it returns unlocked: yes , you have succeeded
If the Fastboot method fails or your phone is unresponsive, the EDL method is a powerful alternative. It works at a more fundamental hardware level by putting the device into a low-level flashing mode. If it returns unlocked: yes
Find the (or Build Number) and tap it seven times until you see a message saying "You are now a developer".
