Here is a way to root this Wiko, finally!
Before doing this, i want to say that me, XDA or nobody exept you is responsible of what you can do on your phone, this method work for me, surely for you, but this operation will delete all your data, so remember to backup your data.
Now, you Have to go to Developper options, enable "OEM Unlocking", "USB Debugging" and disable "Verify apps over USB"
After, set "Select USB Configuration" to MTP. After That, download file (https://mega.nz/#!ioBQDZra!z6ntj85aM...Y9HQiDkKuYbxcU) and extract it
Connect your phone to your Computer, Copy and Paste the SuperSU zip file in your SD card, and reboot your phone in fastboot mode (shutdown, and boot it by pressing Power and Vol+, then, when you have a choice between recovery and fastboot, select fastboot by clicking Vol-)
Open a command prompt in the extracted file, and type: fastboot oem unlock
Here, all your data will be lost by a factory reset.
When the phone restart, in the command prompt, type:
ls -l /dev/block/platform/soc/7825900.sdhci/by-name/ (7825900.sdhci may be different, so use tab to find the correct file)
in the list, you will have a file with "recovery -> /dev/block/XXX" (XXX may be like mmcblk0p22)
cat /dev/block/XXX > /data/local/tmp/recovery.img
adb pull /data/local/tmp/recovery.img
fastboot flash recovery "CUSTOM recovery.img"
if there is no problems, you phone restart normally, so stop it, and boot to the recovery (Power and Vol+ and whene the choice appear, Select recovery with Vol+)
if your phone don't want to boot to the TWRP recovery, try to flash the stock recovery, reboot and flash again the custom one. if the problem persist, leave a comment.
In TWRP, swipe the button, and go to Install, Up a level, select external_sd and then, select the SuperSU file, select "Reboot after installation is complete, and swipe to flash.
When it's done, install or not the TWRP app, and reboot. The device can start twice before finally boot, and can be longer than usual, but don't do anything, it's normal.
When the phone finally boot, SuperSU may be installed, so go check if it's true, and if it is, go to the play store and install BusyBox (by Stephen (Stericson))
After the installation is complete, open it, and click install.
If there is no problem, the root acces will be request, so accept it and all is done.
If you have a problem, or any question, ask me.