How to UNROOT your MOTO G

So, you have rooted your phone but want to revert back to the stock firmware? This guide will show you how to UNROOT your MOTO G.

Note: Unrooting might erase your data its mandatory to keep a backup of your data.

Disclaimer: Follow this steps at your own risk, we don't take responsibility if something goes wrong.

UNROOT:

Before you begin Download the following files:

• Motorola Drivers
• Stock Firmware
• Fastboot

Follow this steps to get you MOTO G UNROOTED:

1. Install all the Motorola Drivers which you have downloaded from the above link.
2. Extract the Stock Firmaware and also the Fastboot, preferably on your Desktop.
3. Turn on USB debugging on your MOTO G.
4. Connect your MOTO G via a USB CABLE to your PC.
5. Click START on your PC and then type CMD.EXE(WINDOWS 7 or LATER) for XP goto START>RUN>CMD.EXE and press ENTER).
6. Type the following in the command prompt: 

                  adb reboot-bootloader 

    

   7. After your device is booted into bootloader mode type the following codes in the Command Prompt and press ENTER after every command and make sure it returns OKAY.

mfastboot flash partition gpt.bin
mfastboot flash motoboot motoboot.img
mfastboot flash logo logo.bin
mfastboot flash boot boot.img
mfastboot flash recovery recovery.img
mfastboot flash system system.img_sparsechunk1
mfastboot flash system system.img_sparsechunk2
mfastboot flash system system.img_sparsechunk3
mfastboot flash modem NON-HLOS.bin
mfastboot erase modemst1 
mfastboot erase modemst2 
mfastboot flash fsg fsg.mbn
mfastboot erase cache 
mfastboot erase userdata 
mfastboot reboot

                   

 VOILA! Back to the Stock Firmware.

Let US know if this worked for you below in the comments.

Reference : XDA Devlopers