One of the most frustrating problems for an iPhone user is when it gets stuck on the startup screen with the apple appearing and disappearing in a loop. This phenomenon, called boot loop, can be caused by software or hardware issues. Fortunately, there are several solutions, ranging from simple manipulations to more complex repairs.
Why does my iPhone restart in a loop?
This problem can occur for various reasons, including software errors, hardware malfunctions, or storage-related issues.
The most common software causes
- Interrupted or corrupted iOS update: if the installation of an iOS update was abruptly stopped (empty battery, unstable connection, etc.), the system may become unstable.
- Software conflicts or incompatible applications: some poorly optimized applications can cause system bugs leading to restart loops.
- Failed jailbreak: if your iPhone has been jailbroken and the operation went wrong, it can lead to critical errors and prevent the phone from starting properly.
Possible hardware causes
- Defective or end-of-life battery: a worn-out battery may not provide the necessary power for the device to function properly, causing unexpected restarts.
- Internal connection issues: defective components or a damaged motherboard can prevent the iPhone from functioning normally.
- Water or drop damage: contact with liquid or a violent shock can alter internal components and cause malfunctions.
Other probable causes
- Full storage: an iPhone with saturated storage may have difficulty functioning properly, especially at startup.
- Motherboard issues: a serious hardware failure at the motherboard level can cause a restart loop, requiring professional intervention.
Basic solutions: what to do yourself?
Before considering an expensive repair, several manipulations can be attempted to resolve the problem.
1. Perform a forced restart
A forced restart can fix some temporary bugs without losing data. The method varies depending on the iPhone model:
- iPhone 8 and later models:
- Quickly press the Volume + button and release.
- Quickly press the Volume – button and release.
- Hold the Power (side) button until the Apple logo appears.
- iPhone 7 and 7 Plus:
- Simultaneously hold the Power (side) and Volume – buttons until the apple appears.
- iPhone 6s and earlier models:
- Hold the Power (top or side) and Home buttons until the screen displays the apple.
2. Check the battery status
A defective battery may be the cause of the restarts. To check its status:
- Go to Settings > Battery > Battery Health.
- If the maximum capacity indicator is below 80%, a replacement may be necessary.
3. Free up storage space
If your iPhone restarts but eventually turns on, it is recommended to:
- Delete unnecessary applications.
- Erase large files (non-essential videos, photos).
- Back up your data to iCloud or a computer to free up space.
4. Update iOS via iTunes/Finder
If the problem persists, it is possible to update iOS via a computer:
- Connect your iPhone to a PC/Mac.
- Open iTunes (or Finder on macOS Catalina and later versions).
- Select your iPhone, then click on Update.
⚠️ Do not click on “Restore” as this would erase all your data!
Advanced solutions: when to call a professional?
If none of the previous solutions work, more advanced interventions may be necessary.
1. Restore the iPhone in recovery mode
If the iPhone still cannot start properly, a complete restoration can be considered:
- Connect the iPhone to a computer and open iTunes or Finder.
- Put the device in recovery mode:
- iPhone 8 and later models: press Volume +, Volume –, then hold Power until the recovery mode appears.
- iPhone 7/7 Plus: hold Volume – and Power simultaneously.
- iPhone 6s and earlier models: hold Home + Power.
- In iTunes/Finder, click on Restore (⚠️ this action erases all data).
2. Contact Apple support or an authorized repairer
If the iPhone continues to restart after restoration, it may be a hardware problem requiring specialized intervention.
- Make an appointment with the Apple Store or an authorized center for a diagnosis.
- Check if your iPhone is still under warranty to benefit from a free or reduced-cost repair.
3. Battery replacement or hardware repair
If the problem is related to a defective battery or a damaged component:
- Battery replacement (around 50 to 100 € at Apple depending on the model) can solve the problem.
- In case of more serious damage (such as a defective motherboard), the repair may be more expensive, or even require a device replacement.
