How to Root Moto E 3G (2015) and Flash TWRP Recovery

This tutorial is only for Moto E 3G 2015 model also known as styx 3G or otus 

Pre-Requisites

1. Flash Recovery v1.rar : Download
2. Ttwrp-otus-2.8.7-r4.img : Download
3.  SuperSU.zip : Download

Procedure to Flash TWRP Moto E 3G-2015

1. Extract Flash Recovery v1.rar on Desktop
2. Download twrp-otus-2.8.7-r4.img and rename it to recovery.img
3. Copy recovery.img to Flash Recovery v1 Folder
4. Turn off your device remove battery and insert again.
5. Turn on the device while holding volume down and power.
[Simply press volume down button and then press power button you will be in fastboot mode.]
6. Plug the device into your computer.
6. Now Double Click on install-windows name file.
7. You Recovery will be flashed.Reboot.

Procedure to Root Moto E 3G-2015
1. Once you have successfully booted into twrp recovery.
2. Copy SuperSu.zip into Mobile and Select Install in Recovery locate file and swipe to execute.

Credits:
twrp.img xda user squid2
SuperSu Chainfire