Hi,
sorry english is not my native language.
Assuming you have a pc with windows,
1°) install alcatel drivers from your phone.
Download
alcatel flasher
Download
TWRP 3.1.1
Download
SuperSU.
2°)put supersu on the phone sdcard
3°)reboot your phone in download mode (you have to press volUP + volDOWN during boot, it will bring you to the download mode page, press wolUP then). And plug-it to your pc.
4°)launch alcatel flasher
-Select your model (1).
-click on detect (3).
-click on NPRG (4).
-click on Get GPT (5).
-in partition table (10) look for the recovery partition (#27 on my phone).
- double-click on the checkbox (11) to select it.
-double click on the file field of this partition (12) and validate.
-click on read (7). it will make a backup of your recovery.
-double click on the file field of the partition again (12) and select your TWRPxxx.img .
-click on write (8)
5°)reboot on twrp
press volUP while the phone is booting to launch twrp.
6°) install super su
Select "install", select super-su zip, swipe to install and TADA your phone is now rooted