When an iPhone keeps restarting during a restore attempt, it usually signals a deeper system or hardware issue rather than a simple software glitch. Users often see the progress bar loop, the device reboot unexpectedly, or the phone become stuck in recovery or DFU mode.
This guide walks through realistic causes, targeted fixes, and what to expect when professional service is needed, using a detailed table and focused sections to address the most common concerns.
| Symptom | Likely Cause | Immediate Action | Expected Outcome |
|---|---|---|---|
| Phone restarts in loops during restore | Corrupted iOS update or failing storage | Attempt recovery mode restore with latest firmware | Successful restore or clear error code |
| Device exits restore and returns to home screen | System partition damage or battery health critically low | Check battery health and back up via iCloud before retry | Stable backup and diagnostic info |
| iPhone stuck in recovery or DFU mode | Interrupted update, cable issues, or logic board faults | Use Finder or iTunes with correct IPSW file | Device recognized and restore initiated |
| Error messages such as 56, 4013, or 4002 | USB ports/cables, host controller, or hardware failure | Swap cables and ports; update macOS or Windows drivers | Connection stability check before reflash |
Recovery Mode Restore Challenges
A restore often fails when the device cannot stay in a stable recovery state. An iPhone keeps restarting when trying to restore because the firmware verification step encounters an unexpected reboot, which can be tied to damaged system files or unstable communication with the host computer.
Using the latest version of Finder or iTunes and a known good cable reduces handshake errors. If the phone exits recovery mode automatically, pause background tasks and disable Find My before reconnecting.
Battery and Hardware Diagnostics
Battery health below 80 percent or a swollen cell can cause sudden shutdowns mid-restore, making the device appear to restart. Hardware diagnostics help identify failing components such as the logic board or power management IC before further software attempts risk additional damage.
Check battery performance under Settings > Battery > Battery Health and record any unexpected shutdowns. If diagnostics indicate service required, avoid repeated restore attempts that may stress an already compromised power system.
Firmware, IPSW, and File Corruption
Using an outdated or mismatched IPSW file is a common reason an iPhone keeps restarting when trying to restore. Apple signs firmware versions for a limited time, so selecting the correct build for your model and region is essential for a successful verification step.
Download IPSW files directly from Apple or through a trusted third-party index, verify file size and checksum when possible, and keep a local copy for future attempts without re-downloading.
Advanced Troubleshooting Steps
When basic restore attempts continue to loop, more advanced steps such as manual DFU entry and host system maintenance can resolve stubborn failures. An iPhone keeps restarting when trying to restore in these scenarios until the underlying channel or component issue is resolved.
- Use a dedicated USB port and avoid hubs or docks.
- Update host operating system and device drivers.
- Back up data via iCloud before each major restore attempt.
- Perform a force restart after changing cables or computers.
- Consider professional diagnostics if errors such as 56 or 4013 persist.
Post-restore Stability and Long-Term Reliability
After a successful restore, monitor system stability, backup frequency, and battery behavior to confirm that the iPhone keeps restarting issue has been fully resolved rather than temporarily masked.
FAQ
Reader questions
Why does my iPhone restart as soon as I put it into recovery mode for restore?
This usually indicates corrupted firmware or a failing storage component; try a different cable and USB port, ensure the IPSW matches your device, and if it still restarts, seek professional diagnostics.
Can a drained or aging battery cause restore loops?
Yes, a battery under heavy stress or below healthy capacity can shut down mid-restore; check battery health in settings and keep the device plugged into stable power during the process.
I see error 4013 or 4003 during restore, what should I do next?
These errors often point to USB or host controller issues; update your operating system, replace cables, avoid hubs, and test on another Mac or PC before attempting another restore.
Is DFU mode safer than recovery mode when the iPhone keeps restarting?
DFU mode bypasses the bootloader entirely and can succeed when recovery mode restarts, but it still requires a reliable connection and correct firmware, so use it after checking hardware and cables.