: Connect your device while it is powered off. For MTK models, you may need to hold the volume buttons to trigger "Preloader" mode. Safety and Official Alternatives
Note: Using third-party firmware and auth files carries a risk of permanently damaging (bricking) your device. Only proceed if you are experienced with mobile software repair. Download Vivo Auth Firmware4Mobile com (2) rar
: These are required when a device's bootloader is locked with high security. Tools like the SP Flash Tool or specialized dongles use these files to authenticate the connection with the device's server before allowing any data to be written. : Connect your device while it is powered off