Samsung Galaxy S GT-I9000M
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1st method

  • Power off the phone or remove the battery and reinsert it
  • Press and hold Volume Up + Home Button
  • Keep pressing these 2 buttons and press Power button for 2-3 seconds
  • Release only power button and keep pressing the other 2 buttons
  • With Volume down select wipe/factory reset and press power button
  • Select Yes and press power button
  • Go Back, select reboot and press power button
Samsung Galaxy S GT-I9000M Hard Reset Method 1
Samsung Galaxy S GT-I9000M Hard Reset Method 1

 

2nd method

  • Power off the phone or remove the battery and reinsert it
  • Press and hold Volume Up + Volume down
  • Keep pressing these 2 buttons and press Power button for 2-3 seconds
  • Release only power button and keep pressing the other 2 buttons
  • With Volume down select wipe/factory reset and press power button
  • Select Yes and press power button
  • Go Back, select reboot and press power button
Samsung Galaxy S GT-I9000M Hard Reset Method 2
Samsung Galaxy S GT-I9000M Hard Reset Method 2

 

3rd method

  • Power on the phone
  • Go to Settings -> Privacy -> Factory Data Reset -> Reset Phone -> Erase Everything
  • Insert your pattern or phone lock code if asks
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Let us know if worked by leaving a comment :)