[Android Q&A, Help & Troubleshooting] holydude92:
I'm not too savvy with this tech stuff but i figured if anyone could do it it would be you guy's here... i did not create this nor write it and since i am new i cannot post a link but its from our friends over at yumapk... so w/o further a due:

"Here is the tutorial of getting root access on NEC Terrain.

Before getting access on NEC Terrain, you need to prepare 4 tools:

Ⅰ：Android SDK

Ⅱ: The related drive of NEC Terrain

Ⅲ: cm-hero-recovery.img

Ⅳ: superuser.zi

The first step is to install USB drive:

Firstly, let’s come into this step. Find Setting-Application program-USB debugger button, then check the first option. Next, connect your USB line with PC, it will prompt you to install driver. If it is the 32 bit system, then you are supposed to choose “x86” document to install the drive. Whereas, if it is 64 bit system, choose “amd64” document to install the drive.

The second step is to prepare the software for NEC Terrain:

In detail, remove the “TMG” document in your software kit to the root directory in C disk, in order to give us the convenience of finding C:\TMG\

The third step is to examine adb.exe and fastboot.exe:

To begin with the third procedure, all we need to do is to ensure that we have the document of adb.exe and fastboot.exe in TMG. So we need to accomplish those procedures one by one.

The fourth step is to check the condition of drive installation:

Unplug your USB line, then shut down NEC Terrain, next press the backspace key. Go on pressing the power key to enter bootloader. Then connect NEC Terrain with PC, and fastbootusb will come out in NEC Terrain. Pay more attention that never press mount at this time.

Open Start-Run-CMD, then enter the order: cdC:\TMG

C:\TMG>_ will come out when the order runs successfully.

Then input the order: fastboot devices.

The fifth step is to start rooting:

Enter: fastboot boot cm-hero-recovery.img after C:\TMG>. Then NEC Terrain will enter the mode of recovery.

We will see seven options in this mode, they are the following ones:

[Home+Back]reboot system now\\restart

[Alt+S]apply sdcard:update.zip\\install update.zip in SD

[Alt+A]apply any zip fromsd\\install any zip file in SD

[Alt+W]wipe data /factoryreset\\delete all datas

[Alt+B]nandroid v2.2 backup\\back up

[Alt+R]restore late stbackup\\recover the final back-ups

[Alt+F]repair ext filesystems\\suggest backing up ROM in NEC Terrain, use the trackball to move the cursor to [Alt+B]nandroidv2.2backup, check it. If there is something wrong with your NEC Terrain, it can also recover.

Now start entering the order, an order is in a line. Pay attention to the small letters and the big letters and also the blank.

adb shell mount /system

adb push su /system/bin/

adb shell chmod 4755 /system/bin/su

adb push Superuser.apk /system/app/

adb shell reboot

After rebooting, you will finally get root access on NEC Terrain."

if this works hopefully someone can make a script to make this more convenient for the others like me

-edit-

also please if it doesn't work, keep in mind I did not write this, and i made this account specifically to share this post because i cannot find any other info and so many people here know more about this stuff than I. NTM there are tons of people here looking for root just like me on this phone