Vivo removed official unlock for Y71. You must use an :
If prompted on the phone screen, allow USB debugging authorization. 🔓 Step 3: Unlock the Bootloader via Command Prompt unlock bootloader vivo y71 high quality
: For persistent issues or if fastboot is restricted, some technicians use EDL (Emergency Download) Mode Vivo removed official unlock for Y71
Unlock Bootloader Vivo Y71 High Quality: The Ultimate Step-by-Step Guide unlock bootloader vivo y71 high quality