Download the drivers from here:
https://docs.google.com/file/d/0B1x1BQ2sB-9iR1VlcDk0TnJ0VEk/edit?pli=1
Click File > Download
MTK chipset preloader drivers are needed if you need to flash your phone with a new ROM using SP Flash Tool. Drivers should work with all MTK chipset based phones including MT6575, MT6515, MT6517, MT6572, MT6577, MT6582, MT6589, MT6592 etc…
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