Restoring the iPhone reinstalls its software.
Restoring an iPhone is usually a method for correcting glitches. However, if the restore is done improperly, it can result in new problems, such as a disruption of the Wi-Fi receiver. Of course, unrelated issues could also be causing a Wi-Fi malfunction coincidentally after a restore.
What Is a Restore?
If the iPhone is malfunctioning and you have tried all other troubleshooting options, your last resort is to restore the phone. This process completely erases everything on the iPhone and then reinstalls the iOS, Apple's mobile operating system. You can perform this process on the iPhone itself, or you can do it through iTunes when the phone is connected to your computer. Because this process erases everything, you lose your personalized settings and data, although you can immediately re-sync all of your media from iTunes. You can either set up the phone as new, reconfiguring all of your syncing settings, or you can set up the phone from a previous backup.
Problems With Restore
Restoring the iPhone takes several minutes, and the phone can't be disturbed during this process. If you unplug the iPhone from the computer before the restore is complete, the software may not install properly. Canceling a restore can also result in a faulty installation, as can not having the latest version of iTunes and the iPhone software. In addition, if you choose to restore the iPhone from a backup, the backup itself might contain a Wi-Fi-related glitch.
Other Wi-Fi Issues
Problems unrelated to the restore may also cause Wi-Fi failures. For example, the Wi-Fi network itself may not be working properly. Testing the Wi-Fi on another device can confirm this. In addition, the iPhone may be experiencing a minor hiccup in its processing rather than a serious software glitch. This can usually be resolved by restarting or resetting the phone, or resetting the network settings under Reset in the General menu of the Settings app. The iPhone might also be in Airplane Mode, which prevents Wi-Fi from working. Moreover, your version of the iOS software may contain a Wi-Fi bug, especially if it has just been released. Apple usually releases patches for these bugs in subsequent updates, so installing the next update when it becomes available may help.
Re-Restore
If you rule out other options and conclude that the iPhone's Wi-Fi is malfunctioning because of a faulty restore, the best option is to perform another restore. If you restored from a backup, choosing a different backup or setting up the phone as new may resolve the issue. Updating iTunes and following the directions carefully will help ensure the restore goes smoothly. If this still doesn't solve the problem, something is likely wrong with the hardware of the phone, which requires the care of an Apple specialist.
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