Hello guys. 
I have successfully ported TWRP 3.0.0-0 for our Smart Prime 6.
It's 100% working !!
There are NO BUGS !!
VIDEO:
NEW LINK:
DOWNLOAD
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Via app:
1) Download TWRP 3.0.0-0 from the link above and place it on internal storage of your phone.
2) Download Flashify app from Google Play Store.
3) Open Flashify app.
4) Grant root permissions.
5) Click "Recovery image" and then click "Choose a file"
6) Navigate to the folder where you placed TWRP 3.0.0-0 and choose the .IMG file.
7) Press "Yup!" button and wait.
8) After a while the phone will require reboot. So click "reboot" button.
9) Phone will reboot and automatically boot into TWRP, so you can press reboot to system.
10) Enjoy!
Special thanks to Oneb1t for modded .fstab file!