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Apple iPhone 3GS hard reset

If iPhone 3GS won't turn on, or if the display freezes or doesn't respond

  • Press and hold the Home button below the screen for at least six seconds, until the application you were using quits.
  • If that doesn't work, turn iPhone 3GS off and turn it on again. Press and hold the Sleep/ Wake button on top of iPhone for a few seconds until a red slider appears, and then drag the slider. Then press and hold the Sleep/Wake button until the Apple logo appears.
  • If that doesn't work, reset iPhone 3G. Press and hold both the Sleep/Wake button and the Home button for at least ten seconds, until the Apple logo appears.

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Updating and Restoring iPhone Software

You can use iTunes to update or restore iPhone 3GS software. You should always update iPhone to use the latest software. You can also restore the software, which returns iPhone to its original state.

If you restore, all data is erased from iPhone 3G, including songs, videos, contacts, photos, calendar information, and any other data. All iPhone settings are restored to their original state.

  1. Make sure you have an Internet connection and have installed the latest version of iTunes from www.apple.com/itunes.
  2. Connect iPhone 3GS to your computer.
  3. In iTunes, select iPhone in the Source pane and click the Summary tab.
  4. Click “Check for Update.” iTunes tells you if there's a newer version of the iPhone software available.
  5. Click Update to install the latest version of the software. Or click Restore to restore iPhone 3GS to its original settings and erase all data on iPhone. Follow the onscreen instructions to complete the restore process.

Resetting iPhone Settings

Reset all settings

Choose General > Reset and tap Reset All Settings.
  • All your preferences and settings are reset. Information, such as your contacts and calendars, and media, such as your songs and videos, are not deleted.
Erase all content and settings

Choose General > Reset and tap “Erase All Content and Settings.”
  • All your information and media are deleted. You must sync iPhone with your computer to restore contacts, songs, videos, and other information and media.
Reset the keyboard dictionary

Choose General > Reset and tap Reset Keyboard Dictionary.
  • You add words to the keyboard dictionary by rejecting words iPhone suggests as you type. Tap a word to reject the correction and add the word to the keyboard dictionary. Resetting the keyboard dictionary erases all words you've added.
Reset Network Settings

Choose General > Reset and tap Reset Network Settings.

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Warning! Always turn off your device before installing/replacing the battery and SIM card.

Apple iPhone DFU mode ( Deep Firmware Upgrade)

1. Turn off iPhone.
2. Connect to mac/pc with sync cable / iTunes.
3. Press and hold HOME and POWER buttons for 10sec.
4. Release only POWER button, but continue pressing HOME button for 10 sec.
Now iTunes should detect iPhone in recovery mode.

General advice: Before you buy a new cell phone or new tablet, please try the following procedure to repair your device in a software way. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before doing factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.! Please also note, that a hard reset operation will not unlock your mobile phone's SIM lock or network lock, but it will remove the unlock pattern, remove the user password or PIN password (NOT the SIM card's 4 digit PIN code). Also note that the firmware version will not be affected in any way, it will not be downgraded, it will remain the same you are using and if you have rooted your device, root privileges remain also unaffected.