Specifications

iPhone 4 Troubleshooting — General Troubleshooting 26
2012-02-21
Common Troubleshooting Procedures
When troubleshooting, attempt the quick xes in the order listed. This table is a summary of
these common procedures; see detailed information on the following pages.
IMPORTANT: These steps may not be eective for all issues. Apply only the steps necessary
to isolate and resolve the issue.
Quick Fix Action
Update to Latest
Software
Go to Settings > General > Software Update, if available; or
Use the latest version of iTunes (www.itunes.com/download) to
check for the latest iOS. Connect the device to the computer, go
to iTunes > (Device) > Summary and click the “Check for Update”
button.
Charge Battery Connect to a known-good power outlet using a known-good Apple
USB Power Adapter and Dock Connector to USB Cable to charge the
battery. Do not charge via a computer port.
Restart A restart forces the device to close all open les and powers o all
hardware components.
1. Press and hold the On/o button on top of the device until a red
slider appears.
2. Slide your nger across the slider to turn o the device.
3. To turn the device on, press and hold the On/o button until the
Apple logo appears.
Reset Perform a reset ONLY if unable to do a restart.
Press and hold both the On/o button and the Home button for at
least ten seconds, until the Apple logo appears.
Force Quit an App Double-click the Home button to display recently used apps. Press
and hold the app until a red minus appears. Tap the red minus to
quit the app.
Erase All Content
and Settings
1
Erases all user content and settings. From the Home screen choose
Settings > General > Reset > Erase All Content and Settings.
If possible, try this before a Restore since it is much faster.
Restore
1
Erases all software and data, and then installs a fresh copy of iOS.
Connect the device to the computer, go to iTunes > (Device) >
Summary and click the “Restore” button.
Recovery Mode
Restore
1
Recovery mode loads only the rmware drivers necessary for iTunes
to recognize the device. See instructions on the following pages.
DFU Restore
1
Device Firmware Update (DFU) allows you to perform a restore when
all other attempts to restore the device fail. See instructions on the
following pages.
1
WARNING: This will delete all user data and settings on the device. A backup should be
done prior, if saving content is important to the user.