Tiny Keyboard Bug Sent Engineers Scrambling

Apple is rushing a software fix after an iPhone keyboard change removed a Czech character from some passcode screens and locked affected users out of their devices. (theregister.com) The bug surfaced after iOS 26, which became generally available in September 2025, dropped the caron, also called a háček, from the iPhone’s Czech keyboard layout used by at least some people in custom alphanumeric passcodes. The Register reported on April 17 that Apple’s iOS engineers in Cupertino began working on a fix days after a Reddit post from 21-year-old student Connor Byrne drew attention to the problem. (theregister.com) Byrne told The Register he used the missing character in the passcode on his iPhone 13, and once the key disappeared he could no longer unlock the phone without restoring it and erasing the files stored on it. Apple had not publicly detailed the bug in its release notes as of April 23. (theregister.com; developer.apple.com) A phone passcode screen is a stripped-down keyboard that has to match the characters a user originally chose, or the password no longer maps to the same input. In this case, one missing symbol on one language keyboard was enough to break that match for at least some users. (theregister.com) Apple’s developer releases page shows iOS 26.5 beta 3 was posted on April 20, 2026, after iOS 26.4.1 shipped on April 8, but the public entries do not say whether either build contains the Czech keyboard passcode fix. That leaves affected users waiting for a patch Apple was described as trying to land in an upcoming major iOS 26 release. (developer.apple.com; theregister.com) The episode turned a tiny localization change into a device-access problem, because passcodes sit at the front door of the phone and a failed fix can mean lost photos, messages, and app data. Byrne said Apple’s quick response was “impressive,” but he also questioned how a duplicated neighboring character and a missing one passed review. (theregister.com) Local roundup coverage in Cupertino framed the scramble as an internal quality-control problem as much as a customer-support one, pointing to pressure on Apple teams to catch edge cases across many keyboards and languages before release. That pressure is harder to see than a cracked screen or dead battery, but it lands directly on the lock screen when something slips through. (patch.com; nationaltoday.com) For now, the story is small in scope and severe for the people hit by it: one absent key, one inaccessible iPhone, and one fix Apple now has to get right. (theregister.com)