iPhone Keeps Restarting? 7 Fixes for Boot Loops

🔍 Why Does Your iPhone Keep Restarting?

Before jumping into fixes, it helps to understand the most common causes:

• Failed iOS update: An interrupted or corrupted update can leave the operating system in a half-installed state, causing the phone to crash on every boot attempt.
• Bad app or app update: A poorly coded app that launches at startup can crash the system repeatedly. This is especially common with apps that use background refresh or notifications.
• Storage full: When your iPhone has zero free space, iOS cannot write temporary files it needs to boot. The system panics and restarts.
• Degraded battery: A battery that can no longer deliver peak voltage will cause the phone to shut down under load, then restart, then shut down again in an endless cycle.
• Hardware failure: Rarely, a failing logic board component or water damage can trigger boot loops.

🛠️ Tools You'll Need

• Phone Charging Port Cleaning Kit (plastic picks)
• MFi-Certified Lightning/USB-C Cable
• 99% Isopropyl Alcohol
• Anti-Static Brush Kit

As an Amazon Associate we earn from qualifying purchases.

📋 Difficulty & Time

🔧 Diagnose & Fix Charging Issues: Step by Step

⚠️ Common Mistakes to Avoid

• Pushing lint deeper instead of pulling it out
• Using metal tools (instant short risk)
• Skipping the cable test — cables fail more than ports
• Cleaning while the device is powered on

🔧 Fix 1: Force Restart Your iPhone

A force restart is different from a normal reboot. It cuts power at the hardware level and can break a software crash loop.

iPhone 8, X, 11, 12, 13, 14, 15, 16, SE (2nd gen+):

1. Press and quickly release the Volume Up button
2. Press and quickly release the Volume Down button
3. Press and hold the Side button until the Apple logo appears (about 10 seconds)
4. Release and let the phone boot normally

iPhone 7 / 7 Plus:

1. Hold Volume Down + Side button simultaneously for 10 seconds until the Apple logo appears

If the phone boots successfully, move on to Fix 3 and Fix 4 to prevent recurrence.

🔌 Fix 2: Charge for 30 Minutes First

If the battery is critically low, the phone may not have enough power to complete the boot process. Plug into a known-good cable and charger (ideally Apple-certified or MFi) and wait at least 30 minutes before attempting another restart. Look for the charging indicator on screen. If you see nothing at all, try a different cable and power adapter.

📱 Fix 3: Delete Problematic Apps

If the phone boots far enough to reach the home screen before restarting, you have a window to act:

1. Immediately go to Settings → General → iPhone Storage
2. Look at recently updated or installed apps at the top of the list
3. Delete any app you installed or updated right before the restarting began
4. If you cannot reach Settings in time, try booting into Safe Mode by connecting to iTunes/Finder and selecting "Update" (this reinstalls iOS without erasing data)

💾 Fix 4: Free Up Storage Space

An iPhone with less than 1 GB of free storage can enter a restart loop. If you can access the phone briefly:

• Go to Settings → General → iPhone Storage and offload unused apps
• Delete old messages with large attachments (Settings → General → iPhone Storage → Messages)
• Remove downloaded music, podcasts, or videos
• Clear Safari cache: Settings → Safari → Clear History and Website Data

If you cannot access the phone at all, proceed to Fix 5.

💻 Fix 5: Update iOS via Recovery Mode

Recovery Mode lets you reinstall iOS from a computer without erasing your data. This is the most effective fix for boot loops caused by a failed update.

1. Connect your iPhone to a Mac (Finder) or PC (iTunes)
2. Enter Recovery Mode: press Volume Up, then Volume Down, then hold Side button until you see the recovery screen (cable + computer icon)
3. Your computer will detect a device in recovery mode
4. Click "Update" (not Restore) — this reinstalls iOS while keeping your data
5. Wait for the download and installation to complete (20-45 minutes depending on connection speed)

Important: If "Update" fails, you may need to use "Restore," which erases everything. Make sure you have an iCloud or iTunes backup first.

⚡ Fix 6: DFU Restore (Last Resort Software Fix)

DFU (Device Firmware Update) mode is deeper than Recovery Mode. It reloads both the firmware and the operating system from scratch. This erases all data on the phone.

1. Connect your iPhone to a computer with iTunes or Finder open
2. Press and quickly release Volume Up
3. Press and quickly release Volume Down
4. Hold the Side button for 10 seconds
5. While still holding Side, also hold Volume Down for 5 seconds
6. Release the Side button but keep holding Volume Down for another 10 seconds
7. The screen should stay black — iTunes/Finder will say it detected a device in recovery mode
8. Click "Restore" and follow the prompts

After the restore, set up your phone and restore from a backup. If the boot loop returns even after a DFU restore, the problem is hardware.

🔋 Fix 7: Check Battery Health

If your iPhone boots successfully but restarts randomly under load (opening the camera, playing games, using GPS), the battery is likely the culprit.

• Go to Settings → Battery → Battery Health & Charging
• If Maximum Capacity is below 80%, Apple recommends replacement
• Check for the message: "Your battery's health is significantly degraded"
• Also check Settings → Privacy → Analytics → Analytics Data — look for files starting with "panic" which indicate hardware-triggered restarts

A battery replacement costs far less than a new phone and solves most hardware-related restart issues.

Recommended: iPhone Battery Replacement Kits on Amazon

🆘 Still Stuck in a Boot Loop?

If none of the above fixes work, the issue is likely hardware-related — a failing NAND chip, damaged logic board, or short circuit. These require professional micro-soldering repair.