TWRP for HomTom HT16 Pro

Above all save your Titanium backup into your pc.
And then, download the twrp at the next link :

http://www.mediafire.com/file/zp5j572a44d7nm5/HT16_Pro-twrp_3.0.3.rar

STEPS TO DO ONCE ONLY :

1) Install (click always YES) "adb-setup-1.4.2.exe" from the next links :

http://www.mediafire.com/file/2df821420xpdp48/ADB_1.4.2.rar

2) Connect your phone to your pc with USB cable.
3) Open CMD (command prompt).
4) Type the next command :

adb reboot bootloader (and press enter)

5) Type the next command :

fastboot getvar all (and press enter)

6) You should see "bootloader unlocked : no"

7) Now type the next command :

fastboot oem unlock (and press enter)

Press volume up (into your phone) to confirm to unlock the bootloader.
9) You will see in the CMD prompt the next messages :

"Start unlock flow", and when it will be finished, you will see "OKAY".

10) Now type the next command :

fastboot getvar all (and press enter)

11) Now you should see "bootloader unlocked : yes"

STEPS TO DO EVERY TIME YOU NEED TWRP RECOVERY :

1) Copy the recovery.img (twrp recovery).
2) Paste the recovery.img inside C:adb (the folder called "adb")
3) Disable OEM unlocking (Developer options).
4) Connect your phone to your pc with USB cable.
5) Open CMD (command prompt).
6) Type the next command :

adb reboot bootloader (and press enter)

7) Type the next command :

fastboot boot c:adbrecovery.img (and press enter)

Enjoy.

Keep in mind that you need your pc every time you will need to enter into twrp recovery.
I suggest you to make immediately the backup of the NVRAM section.