[Supported Devices] potatohead:
(I wrote the 'new' version of rooting out of memory / conjecture, it should not do irreversible harm to your tablet, however, always apply common sense and proceed with caution. Caveat - I am neither a developer nor software engineer.)

'New' version of rooting procedures can be carried out with relative ease now that [MENTION=4995659]krustymars[/MENTION] has done the heavy lifting and ported TWRP to Teclast X16Plus; applies to both native android 5.1.1 and Remix 2.0.

In his write-up, it wasn't mentioned that TWRP can only be installed if X16 Plus's bootloader is 'OEM unlocked' and ROM will only boot if X16 Plus's boot image is patched (insecured), after the flashing of TWRP.

To unlock is not difficult (fastboot oem unlock), but it will also wipe /data of the ROM (making it unbootable too?). Question mark here as I am uncertain whether this action will render the ROM unbootable or not. For the sake of not doing double jobs, we assume it will.

The third condition for the ROM to first boot properly after flashing is the original recovery must be present (again I am not sure if a patched boot image will do the trick; for the same reason above, we assume it won't)

Therefore the only way out is to ensure the bootloader is not re-locked after the flashing of ROM, for us to be able to flash an effective TWRP AFTER the ROM has finished its first boot.

I believe the above are the main reasons why [MENTION=5142404]stratos7[/MENTION] faced difficulties when intending to root via TWRP.

A simple and rudimentary step by step guide as below (you will LOSE ALL DATA in the tablet, backup all your important stuffs before proceeding):

1) Rename the ROM's original recovery.img to recovery.org. Copy krustymars' TWRP over and rename it recovery.img

This is to ensure that after the flashing, the reboot process will fail and the script will not re-lock the bootloader

2) Flash the ROM as per normal (enter DNX Fastboot by pressing vol+ vol- and power button concurrently, then use Intel Platform Flash Tool Program to flash).

3) After a successful flash, the tablet will enter recovery (TWRP) first time during reboot, and failed. It will be stuck in a boot loop (showing TWRP error).

4) Force shut it by pressing the power button for 10-15secs.

5) Enter fastboot by pressing vol- and power button concurrently.

6) Flash the orginal recovery via adb fastboot.

fastboot flash recovery recovery.img

7) Reboot normally and the ROM will load properly (1st successful boot will take a while; as long as you see the Remix OS logo flashing, all are good).

8) 10x click on Build Number to activate Developer's Menu

9) Activate USB debugging

10) Reboot into fastboot by typing

adb reboot fastboot

11) Check to ensure that bootloader is still unlocked.

12) Flash krustymars' TWRP

fastboot flash recovery TWRP_TeclastX16Plus_by_krustymars.img

13) Flash patched boot image

fastboot flash boot boot.img

14) Choose Recovery Mode, ensure X16 Plus boots into TWRP fine

15) Reboot into ROM from TWRP

16) If you are satisfied that all are fine after rebooting into the ROM, and have copied the latest downloaded SuperSU.zip flashable file into the Internal or Micro SD memory, you can either adb reboot fastboot or shutdown the tablet and vol- power button into fastboot, and then choose Recovery Mode from within fastboot to enter TWRP to flash SuperSU to get root.

Do note that you cannot update binaries within Android, you can update the SuperSU app though if a new version comes up in Play store, just not the binaries. If your binaries become outdated, you will need to flash the latest SuperSU.zip again via TWRP.

The necessary files (minus SuperSU, do grab that from Chainfire's site) - https://www.mediafire.com/?3blso8sjw4kb3e6

Once again, proceed with caution / common sense and the above shouldn't land you in any irreversible situation. All the best!

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OLD METHOD

The below instructions for rooting Teclast X16 Plus originated from Teclast's forums. All credits go to the respective creator(s), I merely translated them to post here.

1) Download the standard rooting package from http://www.mediafire.com/download/nrez4ggzau1u8ax/Root.X16Plus.V1.zip

2) Download your corresponding edited boot image file and extracted build prop file (for either Remix OS 2.0 ver B2016062701 or Android 5.1 ver 1.07)

- for Remix OS http://www.mediafire.com/download/b6aazky2y9eqch7/Remix_OS_2.0.zip

- for Android 5.1 http://www.mediafire.com/download/zz40a8cgav385l3/android5.1.zip

3) Download and install Intel's tools and drivers in the order below - http://www.mediafire.com/download/p723or9hxip5eu8/Intel_Flash_Tools.rar

You can omit this step if these drivers are already installed.

- iSocUSB-Driver-Setup-1.2.0.exe

- IntelAndroidDrvSetup1.10.0.zip

- PhoneFlashToolLite_5.5.2.0_win32.exe

4) Download kingroot tool from below, copy the apk file to your X16 Plus and install. There is no need to run the installed app now.

5) Ensure USB debugging is switched on under developer options in your ROM

6) Unzip both the rooting package and your corresponding edited boot image and extracted build.prop files. Cut and paste the unzipped boot image and build prop files into the unzipped rooting package directory.

7) Launch command prompt and change directory to the unzipped rooting package directory

8) Connect your X16 Plus via USB

9) Type and enter - adb reboot bootloader

10) X16 Plus will reboot into fastboot mode

11) Type and enter - fastboot flash boot boot-root.img

12) Type and enter - fastboot reboot

13) X16 Plus will reboot into normal mode, wait for the bootup process to finish

14) Type and enter - su.bat

15) Run the previously install Kingroot app, Kingroot will prompt you to repair root privileges, allow it to do so.

16) Reboot your X16 Plus after the above repair and you will have full root access. If root access is still incomplete, run the above step 14) su.bat command again