Your iPhone freezes after a failed face scan, then restarts instead of letting you into an app. That is the worrying behavior behind reports of an iPhone 18 Pro Face ID bug. But a reboot, a rejected scan, and a forgotten passcode are different problems. The right next step depends on which one you have.
Start with software updates and non-destructive checks. This guide separates a Face ID fault from a forgotten screen passcode and explains when to stop troubleshooting and ask Apple for help. For that separate lockout issue, Tenorshare 4uKey may be relevant; it handles supported screen-lock removal, not Face ID or camera faults, and the process erases the iPhone.
Part 1. What Is Behind the iPhone 18 Pro Face ID Bug?
Some iPhone 18 Pro users have described a specific sequence: Face ID fails inside a protected app, and selecting “Try Face ID Again” may leave the touchscreen unresponsive before the phone restarts. This is an observed symptom, not proof that the issue is widespread or that every failed scan has the same cause.
A software fault is a possible explanation, but the report does not prove every Face ID failure has the same cause. If the phone simply fails to recognize you without crashing, a covered sensor or an enrollment problem deserves attention too. A damaged camera needs a different response from an app authentication error.
Tips:
Note whether your iPhone restarts after Face ID fails, which app was open, and your installed iOS version. Do not repeatedly trigger a crash to test it. If the phone remains usable, back up important content before trying further changes.
Part 2. How to Handle Face ID Problems on iPhone 18 Pro
Work through the non-destructive options when you still know your passcode. Method 2 is only for a separate lockout: skip it if you can already unlock the phone. No unlock utility should be treated as a confirmed repair for this reported crash.
Method 1. Check for an iOS Update
A reported system crash makes an available software update worth checking first. Read its release notes rather than assuming that any newer version specifically fixes Face ID.
-
Back up your iPhone and connect it to Wi-Fi and power.
-
Open Settings → General → Software Update. Install an available compatible public update.
-
After installation, use the phone normally and note whether the same problem returns.
Limitation: Updating is not proof that this particular bug has been fixed. Persistent crashes still need investigation, especially if they occur outside Face ID authentication.
Method 2. Unlock a Forgotten Screen Passcode with 4uKey
Sometimes the bigger obstacle is access: Face ID is unavailable and you cannot remember the passcode. Tenorshare 4uKey provides a desktop screen-unlock workflow for that situation. It is an option for your own device or one you are authorized to manage, not a way to repair the TrueDepth camera.
Its relevant features include:
- Removal of supported four-digit, six-digit, custom numeric, and alphanumeric screen locks.
- Support for screen lockouts such as iPhone Unavailable or disabled-device scenarios.
- An on-screen process for device connection, firmware download, and lock removal.
- Windows and Mac versions, with device-specific compatibility to check before proceeding.
Check Tenorshare 4uKey’s current screen-unlock requirements before starting. View Tenorshare 4uKey
Attention note:
Screen lock removal erases the iPhone. Make sure you understand that consequence and have a usable backup if you need to recover existing content. Keep your linked Apple Account credentials available for activation afterward.
-
Install and open 4uKey on your computer. Connect the iPhone, choose the screen-unlock option, and follow any device-detection instructions.
-
Confirm the detected device information and download the matching firmware. Review the erasure warning before continuing.
-
Start removal and keep the phone connected until completion. Set it up again and restore an available backup when prompted.
Limitation: 4uKey erases device data and does not establish a fix for the Face ID reboot bug. Screen-passcode removal also does not automatically remove Activation Lock.
Official video tutorial: Unlock an unavailable iPhone (4uKey steps begin at 1:51).
Further Reading: Method 3. Use the Passcode Where Available
If the phone remains accessible, avoid repeated biometric retries in the affected app. Use an offered passcode or account-login option while you investigate the crash.
-
Leave the failed authentication prompt rather than repeatedly selecting the Face ID retry option.
-
Use an available passcode alternative. In Settings → Face ID & Passcode, review which features and apps use Face ID before changing any permissions.
Limitation: This is a workaround, not a repair. Some protected actions require biometrics with no passcode fallback, particularly when Stolen Device Protection restrictions apply.
Method 4. Check the Camera and Set Up Face ID Again
For Face ID not working without repeated reboots, check recognition conditions before assuming a system defect.
-
Remove anything covering the TrueDepth camera and make sure your eyes, nose, and mouth are visible.
-
Restart the iPhone, enter its passcode, and try Face ID again.
-
If recognition still fails, open Settings → Face ID & Passcode → Reset Face ID, then choose Set Up Face ID and follow the prompts.
Limitation: Re-enrollment is not a confirmed fix for the reported crash. If setup cannot finish or the camera fails, arrange Apple service instead of repeatedly resetting Face ID.
FAQs About the iPhone 18 Pro Face ID Bug
Why Does My iPhone Restart When Face ID Fails?
A failed scan followed by a freeze and reboot matches the reported app-authentication symptom. It does not identify the cause on your individual phone. Record the app and software version, check for updates, and contact Apple if the pattern continues.
Does Face ID Not Working Mean the Camera Is Broken?
No. Recognition can fail without hardware damage, and the reported reboot behavior may involve software. A persistent camera error or inability to complete Face ID setup is a stronger reason to request diagnostics than an occasional rejected scan.
Can I Unlock My iPhone without Face ID?
Usually, you can use the screen passcode. If you have forgotten it too, a screen-lock reset or removal process may erase the device. That is separate from app-specific authentication, where a passcode alternative is not always available.
Will Resetting Face ID Delete My Photos?
Resetting Face ID removes its enrolled facial data, not your photo library. Do not confuse that setting with erasing the iPhone or removing a forgotten screen lock. Read the confirmation screen carefully so you know which action you are taking.
Should I Erase the iPhone to Fix the Bug?
Not as a first step when you can still access it. Try updates and appropriate non-destructive checks first. If Apple recommends a restore, confirm your backup beforehand. Erasing the phone is not evidence that a hardware fault or recurring software bug will disappear.
Conclusion
The iPhone 18 Pro Face ID bug calls for careful troubleshooting, not repeated retries or an immediate erase. Start with updates, use available login alternatives, and seek service for persistent camera or enrollment failures. Consider 4uKey only if a forgotten screen passcode also prevents access, with its data-erasure requirement clearly understood.
