The phone is running:

{{{
SM-G390F

Android version : 7.0
Baseband version: G390FXXU1AQI2
Build number    : NRD90M.G390FXXU1AQI3
}}}

== Root Device
 * Download Boot & Recovery image from CF-Auto-Root for this device: https://desktop.firmware.mobi/device:289/firmware:13540
 * Enable 'OEM Unlocking' in 'Settings -> Developer options' 
 * Reset device to factory default
 * Put device in Download Mode by Powering it while holding down this keys: Power + Volume Down + Home.
 * Retrieve PIT or download attached file {{{sudo /usr/local/bin/heimdall download-pit --output SM-G390F.pit}}}
 * Use Heimdall to install new images: {{{sudo /usr/local/bin/heimdall flash --pit SM-G390F.pit --RECOVERY recovery.img --CACHE cache.img}}}
 * Reboot phone and rooting will be done automatically
 


== Removing factory applications
{{{
 $ adb shell
 $ su
 $ mount -o rw,remount /system
 $ rm -R /system/app/application-to-be-removed
 $ rm -R /system/priv-app/application-to-be-removed
}}}

file:/system is read-only be default. use {{{mount -o rw,remount /system}}} to make it writable.

== Original firmware

Can be found at http://live.samsung-updates.com/index.php?device=SM-G390F