# KIMU 5.2.0 Increment 40 release notes

## Added

- AES-256-GCM encrypted artifact store.
- Encrypted derived file metadata.
- Legacy plaintext migration and readiness reporting.
- IndexedDB operation queue and reconnect replay.
- Local queued-chat evidence and offline-created conversation identifiers.
- Idempotent server chat operations.
- Versioned conversations, model preferences and settings.
- Incremental sync status, pull and snapshot endpoints.
- Pending/blocked synchronisation banner and Settings controls.
- Encryption, queue and conflict regression tests.

## Preserved

- K2.6 and K2.7 Code switchability.
- Automatic model-specific setting adjustment and K2.7 locks.
- Streaming chat, persistent history, attachments and stop control.
- Code Interpreter, Files/ZIPs, Memory, Skills and Tasks foundations.
- Fully vendored React build and PWA shell.

## Compatibility

Existing SQLite databases are upgraded in place. When a valid master key is configured, active legacy file bodies are migrated on startup. Back up the existing instance and the generated key before deployment.