Press and hold either volume button and the side button until the power off slider appears. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force-restart your device.

Go to Settings > General > Reset > Reset all Content and Settings. Your iPad will then reset to Factory Settings and erase all data stored. Once it has rebooted, you can then set up as new or restore from your most recent backup.

Basically, iPhone error 4013 occurs when a problem arises during the updating or restoring process. You may have accidentally disconnected your iPhone or iOS device during the update process, or there may be a software bug that’s preventing the update from being executed properly.

What is DFU mode? Device Firmware Update mode — or DFU mode for short — is a state that an iPhone or iPad can be put in to get your device back into working order. DFU mode is similar to the BIOS on Windows computers or Recovery Mode on a Mac.

Restart your iPhone

1. Press and hold either volume button and the side button until the power off slider appears.
2. Drag the slider, then wait 30 seconds for your device to turn off.
3. To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo.

Android users:

1. Press and hold the “Power” button until you see the “Options” menu.
2. Select either “Restart” or “Power off”. If you choose “Power off”, you can turn your device back on again by pressing and holding the “Power” button.

All you need to do is press and hold the Power button on the top edge when you have the device in a portrait orientation. After a second or so you’ll see a power off option appear on the display. To complete the process, use the slider to turn off your iPad.

If a power cycle does not resolve your issue, you may need to perform a hard reset. To do so press and hold the Sleep/Wake button and Home button until the Apple logo will appear and iPad will reset. You can also perform a factory device reset.

How to Fix iPhone Error 4013

1. Install the latest version of iTunes. The most common cause of iPhone error 4013 is software.
2. Force restart the iPhone or iPad.
3. Connect the device to iTunes and update it.
4. Check for updates on the Mac or PC.
5. Try a different USB cable.
6. Restore using a different computer.
7. Contact Apple.

For instance, you would use DFU mode if you want to install a previous version of iOS, jailbreak your iPhone or unlock your SIM. If (for whatever reason) standard recovery isn’t working for you to get your device back to working condition, DFU may help you out.

Back up your iPhone if possible, as a DFU restore will erase your iPhone data. Install the latest version of iTunes or macOS on your Windows or Mac. Do not disconnect your iPhone when iTunes or Finder is actively reinstalling the system software and firmware.