With HyperOS 4, Xiaomi intends to make significant changes. The old MIUI code is entirely removed by the business. The system becomes more stable and quicker as a result. In August 2026, HyperOS 4 will be available. It turns into the initial “Zero-Legacy” version.
In HyperOS 3.1, Xiaomi begins to clear up outdated code. The MIUI SDK is eliminated from the Weather and Gallery applications. All legacy code from MIUI 1 to HyperOS 3 is removed. The system eliminates outdated dependencies and sluggish function calls. A new operating system is produced as a result. It decreases bugs and increases speed.
Key changes:
- Removes MIUI backward compatibility layer
- Uses only HyperOS SDK in all modules
- Deletes over 10 years of old code
- Makes updates faster and more stable
HyperOS 4 brings high-performance apps with Flutter and Rust
Xiaomi uses Rust and Flutter to rework key apps. The Weather app on HyperOS 3.1 checks this. These tools are extensively utilized in HyperOS 4. UI is made fluid via Flutter. Rust improves safety and speed. Versions of new apps are not available to older HyperOS users. This eliminates older phones’ backward compatibility.
Key features:
- Flutter for standard UI rendering
- Rust for secure and fast core code
- Modular apps that update independently
- Better stability on all devices
Small improvements are made to flagship phones. Large speed increases are seen in low-cost phones. Xiaomi resolves outdated code issues. The most stable experience in Xiaomi history is what it promises.
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