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1) make a backup with itunes
2) restore the device with itunes
3) select "set up as new device" on the device itself during the setup process after the device is restored. Do not select "set up as new iphone" or restore from this backup" in itunes yet.
4) jailbreak your device following the steps on this website
5) open up cydia for the first time to allow it to "prepare the filesystem". Wait for the respring to happen.
6) start itunes again and select "restore from this backup" to get everything back on there.
Jailbreaks are the most bug-free when they're performed on a clean install, which is why the above method is a good idea. If you can't perform a backup due to the device refusing to turn on, I hope you made either a computer backup or an icloud backup fairly recently, since you'll probably have no choice but to restore your device.