The originally launched with Android 6.0 Marshmallow . While there was no official over-the-air (OTA) update to Android 7.0 Nougat for the base V5 model, you can still find official firmware packages and manual installation guides for system maintenance. Official System Update Options
Modifying system software cancels your manufacturer warranty. vivo v5 android version 70 update portable
Alternatively, repurpose your vivo V5 as: The originally launched with Android 6