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1st method

  • Press menu key -> Settings -> Privacy
  • Press Factory data reset and follow the instructions

 

2nd method

  • Enter *2767*3855#
  • Wait until phone reboots

 

3rd method

  • Press and hold both Volume Down (Green) + Volume Up (Green) and Power on the phone (Yellow)
  • Select Wipe Data / Factory Reset with Volume Keys (Green) and accept with Power on key (Yellow)
Samsung SCH-i405 Stratosphere Hard Reset
Samsung SCH-i405 Stratosphere Hard Reset
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Let us know if worked by leaving a comment :)