AI BriefingiOS update makes it impossible to type Czech characters, leading to iPhone lockout cases
Key point
After iOS 26.4, a Czech háček input error blocked device unlock.
Details
After updating to iOS 26.4, a user became unable to type the Czech special character háček(ˇ) on the lock-screen keyboard, resulting in a failure to unlock their iPhone 13.
This user had previously been able to enter the same character into their passcode under iOS 18, but after the update, the corresponding key on the lock-screen keyboard either changed to a different accent or failed to input, making it impossible to enter their existing passcode.
The issue is limited to the lock-screen keyboard, not the regular keyboard. Once inside the device, the háček still exists, but it cannot be used in the pre-unlock state.
Other workarounds were also blocked.
- Face ID was not in use, and immediately after the update, entering the passcode first is required.
- An external USB keyboard does not work due to the Before First Unlock (BFU) state.
- Apple Support and the Genius Bar could not find an immediate solution either, and there was no clear method other than a reset.
Other cases with the same symptom have also been posted on Reddit, suggesting this is not a single-device issue but rather an iOS keyboard/input regression.
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