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press *#7370# (click this combination of keys on the keyboardin the mobile)
Important:To proceed to reset, the battery must be full and the mobile device connected to the charger. If during the course of reset, the mobile stop receiving electricity it can ruin the internal flash memory of the mobile device and stop function.This option restores the original operating system from the ROM. It Formats the C: partition and deletes all data including the memory card