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Q:How do I return my SX1 to the factory settings or format the phone memory?
A:You can make a software reset (return the settings to defaults) by typing *#7780#.
If you want to return the phone to it's original state (hard reset), follow these steps.
a.be sure that you have the battery fully charged
b.plug the charger
c.type *#7370# or restart the phone with the # and * keys pressed.
d.If you typed the code the phone will restart and the process will take some minutes formating the phone memory (maybe more than 15). If you restarted having the *,# pressed the the phone will also format the phone memory but you will also have a percentage bar on top of the screen showing the procedure completion.
DON'T DO ANYTHING TO INTERUPT THE WHOLE PROCESS OR YOU MAY END UP WITH A DEAD PHONE
Also you may be asked for a code. In case you haven't changed it, it is 12345