How to root a samsung galaxy S3 lite(Samsung S6790)

How do I root a Samsung Galaxy S3 Lite(Samsung S6790). I have tried using **towelroot v3** which returns This phone is currently unsupported and **framaroot** which also returns Your device seems not vulnerable to exploit included in Framaroot This led me to try using KingoRoot which ran for like 15mins and restarted my device. After I reconnected my device, on the menu it still had the option **root** which confirmed that the phone had not been rooted