For developers and custom ROM enthusiasts, "loader" means the bootloader. Vivo devices are notoriously difficult to unlock the bootloader on, but the V9 has specific exploits that allow it.
The Vivo V9 requires "shorting" two specific pins on the motherboard to enter EDL mode. How to Use the Vivo V9 Loader for Unlocking vivo v9 loader
Industry-standard tools such as QFIL (Qualcomm Flash Image Loader) or QPST. For developers and custom ROM enthusiasts, "loader" means
Open a command prompt in your ADB/Fastboot directory and type: fastboot oem edl or adb reboot edl How to Use the Vivo V9 Loader for
Method A: Hardware Test Points (Recommended for Hard Bricks)
A (often called a Firehose or MBN file) is a specific piece of software used to communicate with the Qualcomm Snapdragon 626 processor in a Go to product viewer dialog for this item. while it is in Emergency Download (EDL) mode.