ACHIEVING TEMPORARY ROOT PERMISSIONS
1. Download and install ADB on your PC.
2. Download "mtk-su_r4.zip" and extract "arm64" folder in ADB install directory (C:\adb).
3. Run command below:
adb connect 192.168.0.XX
4. Transfer mtk-su to your /data/local/tmp folder:
adb push C:/adb/arm64/mtk-su /data/local/tmp/
chmod 755 mtk-su
New UID/GID: 0/e
9. Ensure that mtk-su succeeded in setting selinux to permissive by typing the following command:
1. Download rbox's TWRP custom recovery and the latest pre-rooted ROM from your PC and copy it to the root of a USB stick [or microSD card].
2. Connect the USB stick [or microSD] to your AFTV2.
3. Change to USB Storage directory:
Remounting /system read-write...
Remounting /system read-only...
5. Reboot to Recovery:
Ctrl+C (closes out previously ran script)
adb reboot recovery
7. If you copied the recovery and ROM onto a USB stick then you will need to disconnect it from the AFTV2, and connect a USB hub with at least 2 ports to the AFTV2, and connect both a USB keyboard and the USB stick to the hub at this time. If you copied the recovery and ROM onto a microSD then connect a keyboard to the empty USB port at this time.
8. Now unplug then re-plug the power source and you will be presented with the TWRP splash screen.
9. At the boot menu, press the RIGHT arrow key on the USB keyboard to boot into TWRP recovery.
NOTE – whatever you do DON'T let your AFTV2 idle for too long on the initial recovery boot menu screen or it will time out thus restarting, requiring you to repeat the prior steps.
10. Use the arrow keys to select the "Install" in TWRP.
11. "Select Storage", and choose the location where you stored the pre-rooted ROM.
12. Select "Swipe to Confirm Flash" to start the installation.
13. Select "Reboot System" once the file has finished installing in order to restart the AFTV2.
For those feeling a little adventurous/ambitious then feel free to follow this guide created by @g422 as he discuses where to go from here by delving into other avenues to truly tap into the power of your AFTV2 such as what's "Xposed" and the benefits it offers for rooting your device, and also how to backup your current Fire OS install using TWRP.
Also shouts out to @PhoenixMark who created a guide for Mac users based on my write-up as how to enable root here.