So, your iPhone finishes installing the latest iOS update, restarts, and asks for your passcode. That's normal.
You then unlock it, put it back in your pocket, and carry on with your day.
A few minutes later, you pick it up again expecting Face ID to unlock the screen instantly. Instead, nothing happens. Or worse, you see the message "Face ID Is Not Available".
It's easy to assume the update broke your iPhone, but that's not always the case.
Every iOS update changes thousands of lines of software that work together with your iPhone's hardware. Most updates install without a hitch, but sometimes they temporarily disrupt features like Face ID, especially while the device is still completing background tasks after the installation. In other situations, the update simply exposes an underlying issue that had been developing unnoticed.
Understanding the difference is important because most Face ID problems after an update can be fixed at home, while a few point to hardware that needs professional attention.
This guide explains why Face ID may stop working after updating your iPhone, how Apple's facial recognition system actually works, and the steps that usually restore it.
Quick Answer
Face ID may stop working after an iOS update because of temporary software bugs, incomplete background processing, corrupted Face ID data, changed settings, or problems with the TrueDepth camera system. In most cases, restarting your iPhone, installing the latest iOS patch, or resetting Face ID resolves the issue. If Face ID still doesn't work after troubleshooting, the problem may involve the TrueDepth camera hardware and require Apple service.
How Face ID Works on an iPhone
Before jumping into the fixes, it helps to understand what Face ID is actually doing every time you unlock your iPhone.
Unlike older fingerprint sensors, Face ID doesn't rely on a single camera taking a picture of your face. Instead, it uses a collection of specialized components known as the TrueDepth camera system.
When you look at your iPhone, several things happen in just a fraction of a second. A flood illuminator helps your face become visible even in low light. An infrared camera scans your face while a dot projector creates thousands of invisible points across it to build a detailed 3D depth map. That information is then compared with the encrypted facial data securely stored inside Apple's Secure Enclave, a dedicated security processor built into the device.
Only after all of those pieces agree that it's really you does the iPhone unlock.
Because Face ID depends on both hardware and software working together, even a small disruption can prevent authentication. A software update may temporarily interrupt communication between these components, while damaged hardware can stop the system from working altogether.
How This Problem Usually Starts
Many people don't notice a problem during the update itself.
Instead, Face ID often works immediately after the installation because iOS asks for your passcode after every restart as an added security measure. The issue becomes obvious only the next time you try unlocking your phone with your face.
Some users notice Face ID becomes slower. Others find it works only occasionally. In more severe cases, the Face ID setup screen refuses to complete, or iOS displays an error saying the feature isn't available.
Thinking about what changed recently provides one of the biggest clues during troubleshooting. If Face ID stopped working immediately after installing iOS and the phone wasn't dropped or exposed to water, there's a good chance you're dealing with a software-related issue rather than physical damage.
Before You Start Troubleshooting
Before changing settings or resetting Face ID, spend a minute checking a few simple things.
Ask yourself these questions:
- Did the problem begin immediately after installing iOS?
- Has the iPhone recently been dropped?
- Is the front camera clean and free of fingerprints?
- Are you using a thick screen protector or camera protector that covers the sensors?
- Does the front-facing camera work normally during selfies or video calls?
These quick observations help narrow down the cause. A problem that appears only after an update often points toward software. A problem that starts after a drop or water exposure is more likely related to hardware.
Why Face ID May Stop Working After an iOS Update
Although it can seem like the update is to blame, several different issues can produce the same symptom.
Temporary Software Glitches
Like any operating system, iOS can experience temporary bugs after a major update.
During installation, system files are replaced, security components are updated, and background services restart. Occasionally one of those processes doesn't complete perfectly the first time, preventing Face ID from communicating properly with the TrueDepth camera.
Fortunately, these glitches are usually temporary and often disappear after a restart or a minor iOS patch.
Background Tasks Are Still Running
After installing a major iOS release, your iPhone continues working behind the scenes for quite some time.
It may be indexing photos, rebuilding search databases, optimizing apps, syncing iCloud data, or performing security checks. These background activities can temporarily increase processor activity and occasionally interfere with system responsiveness, including biometric features like Face ID.
This is why some users find that Face ID starts working normally again several hours after the update finishes.
Face ID Data Needs to Be Reinitialized
Your facial information isn't deleted during a normal iOS update, but the software that processes it is updated.
In rare cases, the stored facial profile may no longer communicate correctly with the updated system software. Resetting Face ID and creating a new facial scan often resolves this mismatch.
Think of it like updating the operating system on a computer. Your files usually remain intact, but certain settings occasionally need to be reconfigured afterward.
A New iOS Bug
Not every software update is perfect.
Apple thoroughly tests new iOS releases before making them available, but millions of devices with different usage patterns often reveal bugs that weren't discovered during testing.
If many users report Face ID problems after the same update, Apple typically addresses the issue with a follow-up software patch within days or weeks.
The Update Revealed an Existing Hardware Problem
This possibility surprises many iPhone owners.
An update rarely damages Face ID hardware. However, it can expose a component that was already beginning to fail.
For example, the TrueDepth camera may have suffered minor damage from an earlier drop without causing immediate problems. After the software update changes how the hardware communicates with iOS, that weakness becomes much more noticeable.
In these cases, software troubleshooting won't completely solve the problem because the underlying issue lies inside the camera system itself.
How to Fix Face ID That Stopped Working After an Update
Now that you understand why Face ID can stop working after an iOS update, it's time to work through the possible fixes.
The best approach is to start with the simplest solutions before moving to more advanced ones. Many Face ID issues are caused by temporary software glitches, so there's no need to jump straight to resetting your iPhone.
1. Restart Your iPhone
Restarting your iPhone may sound almost too simple, but it's one of the most effective first steps after any software update.
During an update, iOS replaces system files, restarts background services, and initializes security features like Face ID. Occasionally, one of these services doesn't restart correctly. A reboot forces iOS to reload these processes from scratch.
To restart your iPhone:
- Press and hold the Side button and either Volume button.
- Drag the power slider.
- Wait about 30 seconds.
- Turn your iPhone back on.
After restarting, lock your iPhone and try unlocking it with Face ID several times.
What to expect: If a temporary software glitch caused the problem, Face ID should begin working normally again.
2. Clean the TrueDepth Camera
Face ID depends on the sensors located near the front camera.
Unlike a standard selfie camera, the TrueDepth system projects thousands of invisible infrared dots onto your face. Even a thin layer of fingerprints, dust, makeup, or pocket lint can interfere with this process.
Take a soft microfiber cloth and gently clean the top portion of the display where the front camera and sensors are located.
Also check for:
- Dirty screen protectors
- Camera lens protectors
- Cracked glass around the front camera
- Dust trapped inside certain phone cases
What to expect: If the sensors were partially blocked, Face ID recognition should immediately become faster and more reliable.
3. Check That Face ID Is Still Enabled
Although uncommon, certain settings may change after a software update or restoration.
Open:
Settings → Face ID & Passcode
Verify that Face ID is enabled for the features you use, including:
- iPhone Unlock
- App Store & iTunes
- Wallet & Apple Pay
- Password AutoFill
- Other supported apps
If Face ID is disabled for unlocking your phone, simply turning it back on may solve the issue.
What to expect: Once re-enabled, Face ID should function normally without further troubleshooting.
4. Install Any New iOS Updates
Ironically, the fix for an update problem is sometimes... another update.
Major iOS releases occasionally introduce unexpected bugs that only appear after millions of people install them. Apple usually responds quickly by releasing smaller updates that address these issues.
Check for updates by going to:
Settings → General → Software Update
If a newer version is available, install it.
What to expect: If the problem is caused by a known software bug, the latest update may restore Face ID without any additional steps.
5. Reset Face ID
If Face ID settings became corrupted during the update, creating a new facial profile often resolves the issue.
Resetting Face ID doesn't delete any personal data. It simply removes your saved facial scan so you can register your face again.
To reset Face ID:
- Open Settings.
- Tap Face ID & Passcode.
- Enter your passcode.
- Tap Reset Face ID.
What to expect: The previous facial profile is erased, allowing you to create a fresh one that's fully compatible with the current version of iOS.
6. Set Up Face ID Again
After resetting Face ID, complete the setup process immediately.
Follow the on-screen instructions as your iPhone scans your face from different angles.
For the best results:
- Hold the phone about an arm's length away.
- Stay in good lighting.
- Remove sunglasses or anything covering your face.
- Slowly move your head as instructed.
If setup completes successfully, test Face ID several times before considering the issue resolved.
However, if the setup process repeatedly fails or displays "Face ID Is Not Available," the problem may involve the TrueDepth camera rather than the software.
What to expect: Successful setup usually confirms that the software side of Face ID is functioning correctly.
7. Inspect Your iPhone for Physical Damage
It's easy to blame the latest iOS update because that's when the problem became noticeable. However, updates sometimes reveal hardware issues that were already present.
Think back over the last few weeks.
Has your iPhone:
- Been dropped?
- Been exposed to water?
- Had its screen replaced?
- Developed cracks near the front camera?
The TrueDepth camera contains delicate sensors that can stop working after physical damage, even if the display itself still looks fine.
Third-party screen replacements can also affect Face ID if the repair wasn't performed correctly.
What to expect: If physical damage is responsible, software troubleshooting alone is unlikely to restore Face ID.
8. Reset All Settings
If the issue persists, resetting all settings is the next logical software step.
This option restores system settings to their defaults without deleting your photos, apps, or personal files.
Go to:
Settings → General → Transfer or Reset iPhone → Reset → Reset All Settings
You'll need to reconnect Wi-Fi networks and reconfigure certain preferences afterward, but your personal content remains intact.
What to expect: If a corrupted system setting is preventing Face ID from working, this reset often clears the problem.
9. Restore Your iPhone
If none of the previous fixes help, the operating system itself may have become corrupted during the update.
A complete restore reinstalls iOS from scratch, replacing damaged system files that ordinary troubleshooting cannot repair.
Before restoring:
- Back up your iPhone to iCloud or a computer.
- Restore using Finder on a Mac or iTunes on a Windows PC.
- Set up the device and test Face ID before restoring your backup if possible.
This helps determine whether the issue is truly software-related.
What to expect: If Face ID still doesn't work on a freshly restored iPhone, the problem is likely hardware rather than software.
10. Contact Apple Support
If you've restarted your iPhone, reset Face ID, installed the latest iOS update, and even restored the device without success, it's time to seek professional assistance.
Apple technicians can run diagnostic tests on the TrueDepth camera system to determine whether one of its components has failed.
This is especially important if:
- Face ID setup never completes.
- "Face ID Is Not Available" appears constantly.
- The front camera system has been damaged.
- The problem began after a drop or liquid exposure.
Because Face ID relies on security components that are paired to your specific iPhone, repairs usually require Apple or an authorized service provider.
A professional diagnosis can save you from spending more time trying software fixes for a problem that ultimately requires hardware repair.
How to Tell Whether It's a Software Problem or a Hardware Problem
One of the biggest questions people have after Face ID stops working is whether they can fix it themselves or if the iPhone needs repair.
Fortunately, the symptoms often provide useful clues.
| Signs of a Software Issue | Signs of a Hardware Issue |
|---|---|
| Face ID stopped working immediately after an iOS update | Face ID stopped working after the iPhone was dropped or exposed to water |
| Restarting the iPhone temporarily helps | Restarting makes no difference |
| Face ID setup completes successfully after being reset | Face ID setup cannot be completed |
| Installing a newer iOS version improves the problem | "Face ID Is Not Available" appears constantly |
| Face ID works occasionally but inconsistently | Face ID never works under any condition |
A software issue usually improves after one or more troubleshooting steps. Hardware problems, on the other hand, tend to remain consistent regardless of what software changes you make.
If Face ID refuses to work even after resetting it, reinstalling iOS, and updating to the latest version, the TrueDepth camera system is the most likely cause.
Can an iOS Update Actually Break Face ID?
This is one of the most common misconceptions.
An iOS update rarely damages Face ID itself.
Instead, updates can temporarily introduce software bugs, reset certain settings, or require the operating system to rebuild security and biometric data. These issues are often resolved by restarting the device, resetting Face ID, or installing Apple's next maintenance update.
In some situations, the update simply uncovers a hardware fault that was already developing. For example, a weakened TrueDepth camera component may continue working until a software update changes how the hardware is initialized. The timing makes it appear as though the update caused the failure, when it merely exposed an existing problem.
This distinction is important because it helps set realistic expectations. Most Face ID issues that begin after an update are temporary, while persistent failures often point to hardware rather than software.
Frequently Asked Questions
Why did Face ID stop working immediately after updating my iPhone?
Major iOS updates modify system files and security components that work with the TrueDepth camera. Temporary software glitches, background processing, or corrupted Face ID data can prevent facial recognition from working properly until the issue is resolved.
Does resetting Face ID delete my photos or personal data?
No.
Resetting Face ID only removes the stored facial recognition profile. Your apps, photos, contacts, messages, and other personal files remain untouched.
Can a screen replacement stop Face ID from working?
Yes.
The TrueDepth camera contains security components that are paired to your iPhone during manufacturing. If the display or front camera assembly is replaced incorrectly or with incompatible parts, Face ID may stop functioning.
How do I know if the TrueDepth camera is damaged?
Signs of hardware failure include:
- Face ID setup never finishes.
- "Face ID Is Not Available" appears repeatedly.
- Face ID never works after restarting or resetting it.
- The issue began after dropping the phone or liquid exposure.
Apple or an authorized repair provider can run diagnostics to confirm whether the hardware is faulty.
Should I downgrade to an older version of iOS?
In most cases, no.
Apple generally stops signing older iOS versions shortly after releasing updates, making downgrades difficult or impossible. Even when available, downgrading doesn't always resolve Face ID issues and may introduce compatibility or security risks.
Waiting for the next iOS patch is usually the better option if the problem is caused by a newly discovered software bug.
Summary
Face ID is one of the most sophisticated security features on an iPhone, relying on a combination of specialized hardware and intelligent software to recognize your face in an instant. Because these systems work so closely together, it's not unusual for Face ID to temporarily misbehave after a major iOS update.
Fortunately, most cases are caused by software rather than permanent hardware failure. Restarting your iPhone, checking for a newer iOS update, cleaning the TrueDepth camera, or resetting Face ID is often enough to restore normal operation.
If none of these solutions work and Face ID continues displaying errors or refuses to complete setup, the issue is more likely related to the TrueDepth camera hardware. At that point, contacting Apple Support or visiting an authorized service provider is the most effective next step.
By understanding why Face ID stopped working instead of simply trying random fixes, you'll be able to diagnose the problem more quickly and choose the solution that's most likely to get your iPhone unlocking smoothly again.