How To Format Samsung Galaxy S Duos

First you all have to do is to switch your phone off .... After it completely off then first press the MIDDLE BUTTON while holding the MIDDLE BUTTON press and hold the SWITCH ON button ,  then a screen will appear having a list : reboot system now
                                    : apply update from sdcard
                                    : WIPE DATA/ FACTORY RESET
                                    : wipe cache partition
                                    : test redbend fota[FS]
After getting this list go down by using the volume keys and just select the  WIPE DATA/ FACTORY RESET link (note:- screen touch function will not work in this mode) ... The link will be selected by the pressing the middle button! the phone will start the RESET/FORMAT process.... After it gets reset it will ask you for a GMAIL id give your gmail id it is necessary to give if you phone gets locked by pattern lock or security code (note:- Make sure you connected to internet connection while giving the gmail id)... the next will appear your beautiful screeen of SAMSUNG GALAXY S DUOS ... 


Dial the secret code *#0*#. Now you get a screen with title LCD TEST and below that you have lots of option to test various hardware parts of your phone such as speaker, sensor, lcd, etc
2. while testing the touch you have to touch and mark all the squares back button does not work
Other use full secret codes for android phone tested on galaxy y
  • * #1234# to check software version of phone.
  • *#12580*369# to check software and hardware information.
  • *#0228# Battery status (ADC, RSSI reading)
  • *#32489# Service mode
  • *#7780# factory data reset galaxy y
  • *2767*3855# Full factory reset (Don’t dial it does not ask you to confirm unless you have problem)
These codes will work on all the models of galaxy series.