Thanks to LIFEHACKER for the TUTO.
Step One: Reset
Most of the time it's as simple as resetting your device. Hold down the power button and the home button simultaneously for 5-10 seconds (it can vary depending on the state of your device). Eventually you should see the Apple logo and iDevice will boot as normal. If not, try releasing both buttons and turning on your device as normal. As a precaution, plug your device into your computer and do a full restore in iTunes.
How to Restore
If you've never restored an iDevice before it's pretty easy. Just click on its name in the lefthand column in iTunes, go to the Summary section (if it's not already selected by default), and click the Restore button. This will download the latest available version of iOS from iTunes and install it on your iPhone, iPod touch, or iPad. iTunes will know what type of device you have and download the appropriate version. When it finishes, you'll be asked to restore from a previous backup (assuming you made one—something you should be doing regularly) or set up your device as new. Assuming you have a backup, restore from it, then sync your device with iTunes when it finishes. Because a restore wipes out all data and an iTunes backup only retains settings, preferences, and other basic information, this sync can take quite awhile—especially if you have a lot of music and movies. Be prepared to let your phone sync for as long as an hour. When it's done you should be back to normal again.
If you've never restored an iDevice before it's pretty easy. Just click on its name in the lefthand column in iTunes, go to the Summary section (if it's not already selected by default), and click the Restore button. This will download the latest available version of iOS from iTunes and install it on your iPhone, iPod touch, or iPad. iTunes will know what type of device you have and download the appropriate version. When it finishes, you'll be asked to restore from a previous backup (assuming you made one—something you should be doing regularly) or set up your device as new. Assuming you have a backup, restore from it, then sync your device with iTunes when it finishes. Because a restore wipes out all data and an iTunes backup only retains settings, preferences, and other basic information, this sync can take quite awhile—especially if you have a lot of music and movies. Be prepared to let your phone sync for as long as an hour. When it's done you should be back to normal again.
Step Two: Enter DFU Mode
When resetting doesn't do the trick, you need to tell your iDevice to go into DFU mode. This method should seem familiar if you've tried to jailbreak as DFU mode is generally necessary in the jailbreaking process as it's usually used for recovery purposes. You're going to need to disconnect it from power/your computer temporarily in order to do this, so be sure to let your device charge for 10-15 minutes beforehand.
- Presumably your device won't turn on or off, so let's first make sure it's off. Just like in the reset section, hold down the home and power buttons until your device shuts off.
- Hold down the home button.
- While still holding the home button, connect your iDevice to your computer. (The computer you use to sync with iTunes.)
- When you see a screen with a USB cable and a picture of the iTunes icon, you can let go of the home button.
- Restore your iDevice with iTunes using the restore instructions in the previous section.
That's one way to enter DFU mode that you can do while your device is still connected to your computer. You'll need a clock to help you count (don't count in your head!). Here are the steps:
- Make sure your device is off.
- Hold the power and home buttons for 10 seconds.
- Release the power button but continue holding the home button for 10 more seconds.
- Release the home button
- Restore your iDevice with iTunes using the restore instructions in the previous section.
Hopefully one of these ways should make it possible to restore your device, but if not then move on to the next step.
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