https://sudonull.com/ios-26-4-1-iphone-crashes-and-inability-to-downgrade
iPhone users report crashes after installing iOS 26.4.1. Devices go into Recovery Mode, downgrade to iOS 26.4 is impossible. Find out what to do.
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https://sudonull.com/caron-ˇ-disappeared-from-ios-iphone-lockout-with-czech-password
iOS 26.4 update removed caron (ˇ) from the lock screen keyboard, blocking access to iPhone. Technical details, bypass attempts, and risks for custom passwords. Learn how to avoid data loss.
https://sudonull.com/rcs-4-0-video-calls-and-e2ee-in-chats
Learn about RCS Universal Profile 4.0: built-in video calls, text formatting, media optimization and end-to-end encryption. For Android/iOS developers — detailed breakdown of features and API.
https://sudonull.com/e2ee-rcs-in-ios-26-5-beta-testing
End-to-end encryption RCS in iOS 26.5 available in beta by default. Activation details, limitations and RCS Universal Profile 4.0. Test for cross-platform security — read the analysis.
https://sudonull.com/swift-and-android-development-updates-for-the-week
Key mobile development news: Swift memory, Android bottlenecks, Gemma 4, Swift on Android SDK. For middle/senior dev. Study optimizations and new APIs.
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