This is a free method i discovered recently and i managed to unlock my Airtel Alcatel MIFI as you can see from the screenshot.
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You need a PC and USB cable. Download this software from the link below https://mega.nz/#!TEZRyajb!9TdfnppyUIa9ap84yrOcO6CT21jmNY7npdEpyHrga7c
Extract files and Run Z3x MTK.exe as Administrator (make sure to disable windows defender first before running)Choose trial version then 2G MTK calculator.
Phone model- scroll down and choose Alcatel X200S enter Your MIFI IMEI number then click calculate codes(make sure your MIFI is connected via USB)
Utaona your NCK code enter it and unlock your Router.
If it helps feel free kutuma 100 ksh worth of airtime