If you have forgotten your Samsung Galaxy Trend Lite S7390 unlock password or pattern, you can simply auto-reset and wipe all its previous data yourself. This is called, wiping data or factory resetting.
To do this, follow steps below:
1.Turn Your Phone In Switch Off Mode.
2.Press and hold Volume up + key and Volume Down - >>Home key then press and hold Power key Simultaneously .Do not release any key until you see Samsung logo.
3.When Recovery mood appears Select Wipe data and press Power key
4.press again power key.
5.Wait and Select Reboot Device Option.
6. Now Hard reset done
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