Updating an iPhone is usually a straightforward process. The device restarts, the installation begins and, in most cases, your apps, files and settings remain exactly where you left them.
However, with the iOS 27 update now rolling out, iPhone users may be wondering whether an update can put their data at risk.
Apple says a normal iOS update does not erase your personal data or settings. The bigger concern is what happens if an iPhone update problem occurs and the installation fails or gets interrupted.
Can an iPhone update erase your data?
Under normal circumstances, updating an iPhone to the latest version of iOS should leave your data and settings unchanged.
The risk arises when an update does not complete properly. A failed installation can sometimes leave an iPhone stuck on the Apple logo, frozen during the update or displaying a message asking the user to connect the device to a computer.
This is when knowing the difference between Apple’s Update and Restore options becomes important.
Why internet connection matters during an iPhone update
A stable internet connection is important when updating an iPhone.
Apple says an internet connection is required to update the device. The iPhone also verifies the update with Apple’s servers before installation.
If that verification fails, users may receive a message saying the update could not be verified because the device is no longer connected to the internet.
In many cases, this simply stops the update. However, an interrupted installation can create a more serious iPhone update problem, particularly if the device becomes stuck during the process.
Update or Restore: Which option should you choose?
If an iPhone becomes stuck and needs to be connected to a computer in recovery mode, Apple provides two options: Update and Restore.
The two options have very different consequences.
Choosing Update reinstalls iOS while attempting to preserve the device’s data and settings. Apple recommends trying this option first.
Choosing Restore, meanwhile, reinstalls iOS and erases the data on the iPhone.
Apple’s use of the word “attempt” is important. The Update option is designed to preserve your data, but it does not guarantee that everything will be recovered if the installation has failed.
If Update does not solve the problem and a Restore becomes necessary, data that has not been backed up may be lost.
Why you should check your iPhone backup before updating
Apple recommends backing up an iPhone before installing an iOS update.
Users can back up their devices through iCloud or a computer. An up-to-date backup can be crucial if an update fails and the iPhone later needs to be restored.
iCloud Backup can automatically back up an iPhone when the feature is enabled. Apple says the device needs to be connected to Wi-Fi, turned on, locked and connected to power.
However, an iCloud backup can stop if there is not enough available iCloud storage.
That means some users may believe their iPhone is being backed up automatically when their most recent successful backup could actually be weeks or months old.
Five things to check before installing iOS 27
1. Check your latest backup
Go to Settings > [your name] > iCloud > iCloud Backup and check the date and time of your most recent backup.
If the backup is not recent, select Back Up Now and keep the iPhone connected to Wi-Fi until the process is complete.
2. Check your iCloud storage
Make sure your iCloud account has enough available storage for a new backup.
If the storage is full, a new backup may not be completed.
3. Keep your iPhone charged
Connect the iPhone to power before starting the update. A reliable Wi-Fi connection is also recommended during the process.
Avoid starting a major update when the device has a low battery or when the internet connection is unstable.
4. Don’t immediately choose Restore
If your iPhone becomes stuck and recovery mode is required, Apple recommends trying Update before Restore.
Restore erases the device, while Update attempts to reinstall iOS without removing your data.
5. Keep another backup
For important photos, documents and other data, maintaining a computer backup in addition to iCloud can provide another layer of protection.
What happens if you’ve already lost data?
Not all iPhone information necessarily depends on a single full-device backup.
Data that is separately synchronised with iCloud, including information such as iCloud Photos, Contacts, Calendars and Notes, may remain available in your iCloud account if those services were enabled.
After restoring an iPhone and signing back into the relevant Apple account, some synchronised information may therefore return even if the device’s most recent full backup was older.
However, data that existed only on the device and was never backed up or synchronised may not be recoverable after a restore.
