Missing Caron Symbol (ˇ) on Czech iOS Keyboard Locks User Out of iPhone
Connor Byrne, a student using an alphanumeric password with the Czech caron symbol (ˇ), lost access to his iPhone 13 after updating from iOS 18 to iOS 26.4. The lock screen no longer displays this symbol in the Czech keyboard layout, replacing it with an accent mark. The device remains locked despite bypass attempts.
The password includes non-standard characters, which was possible in iOS 18—the last version with full support for special symbols on the lock screen. After the update, the keyboard visually responds to attempts to enter ˇ (with animation and sound), but the symbol doesn't register in the password field.
Technical Details of the Limitation
Internal tests on iPhone 16 (updating from iOS 18.5 to iOS 26.4.1) confirmed a system-wide change: the ˇ symbol is present on the Czech keyboard but ignored in the user password context. This affects the "pre-first-unlock" state, where:
- Wired accessories (including external keyboards) are blocked.
- Face ID requires entering the password to activate after an update.
- Autofill and handwriting input interpret ˇ as a quotation mark or degree symbol.
Long-pressing keys doesn't reveal hidden symbols. Rolling back to iOS 26.3.1 is impossible without unlocking, and changing the password requires device access.
Apple Support recommends a reset, which wipes data. Genius Bar also failed to resolve it: the technician started a restore without consent.
Bypass Attempts and Consequences
Byrne tested alternatives:
- Entering the replacement accent mark—didn't work.
- Writing the password on paper or in a text editor with handwriting recognition—ˇ isn't recognized correctly.
- Scanning with autofill—the symbol gets distorted.
The device holds valuable photos without an iCloud backup. The iPhone 13 with a damaged screen has no material value, but data loss is critical. The user switched to Android as a temporary fix, awaiting a patch, but Apple hasn't responded since 2024 (iOS 18 release).
Key Takeaways
- System-wide removal: The ˇ symbol is excluded from password input on the lock screen in iOS 26.4+, remaining only on the regular keyboard.
- Pre-unlock restrictions: The "pre-first-unlock" state blocks peripherals and biometrics until PIN entry.
- No backup, no recovery: Data is wiped on reset without cloud archive.
- Problem scope: Affects non-standard passwords with diacritics in localized layouts.
- Support is useless: Official channels only offer a wipe.
Recommendations for Developers and Users
For mid/senior specialists working with iOS:
- Avoid diacritic symbols (ˇ, acute, etc.) in passwords during testing.
- Test localized keyboards in the Xcode simulator for edge cases.
- Ensure iCloud backups before major updates (iOS 18 → 26.x).
- Document risks in release notes for custom passcodes.
The issue highlights risks of undocumented changes in the keyboard input stack. Apple prioritizes UI uniformity at the expense of rare localizations. Monitor iOS release notes for similar regressions in Unicode support.
— Editorial Team
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