These are official Vivo firmware. Installing them voids warranty, trips Knox-like security, and may permanently break some functions.
The Vivo V5 shipped with Android 6.0 (Marshmallow) and Funtouch OS. An official Android 7.0 (Nougat) update improved performance, multitasking, notification handling, and battery life for many users. This portable guide explains what the update includes, how to prepare, how to install (official and manual options), troubleshooting tips, and important precautions. vivo v5 android version 70 update portable