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My iPhone 3Gs turns off and on itself, again and again when I charge it, then it shows the battery sign but does not start. It all started happening after I updated my iOS. What should I do? How should I make sure that my data on my iPhone is not erased?

  • This happened with my iPhone when a charging cord was going bad. After switching to another cord, my iPhone charging is now as expected. – GEdgar Dec 20 '13 at 17:34
  • no this is not the reason because i have tried different chargers on diffrent places, it is not working. – Aroosa mazhar Dec 21 '13 at 6:32
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after you updated did you restore from a backup or did you set it up as a new iPhone? To be honest it sounds like your iPhone may have water/physical damage.

  • no it is not physically damaged, actually in setting it was showing that there is need to update so i choose updating opption then the download continued for 2 or 3 hour and after that when i saw it was blinking with apple logo. – Aroosa mazhar Dec 21 '13 at 6:31
  • m worried aout all my data that was in iphone, i dont wanna lose it:( – Aroosa mazhar Dec 21 '13 at 6:33
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Change your battery this method will work

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    How do you change the battery? – user151019 Nov 28 '14 at 14:38

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