You need to doing hard reset to make your
samsung jet s8000 unlocked from your old password. Follow this step to
unlock samsung jet s8000 password and reset it to default factory setting :
1. Press Menu.
2. Press Settings.
3. Press Reset settings.
4. Press All or the settings you want to reset.
5. When the box next to a menu item is ticked (V), the setting will be reset.
6. Press Reset.
7. Key in the phone lock code and press Confirm.
8. If it is the first time you use the phone lock code:
9. Key in the phone lock code again and press Confirm.
10.Press Yes.
But remember that method also wipe out all your previous data in that phone.
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