During January 2025, Jingmatrix contributed to the bmax121/APatch repository, focusing on enhancing security and configuration accuracy for Android applications. Jingmatrix addressed a critical SELinux context issue by updating the default context from 'magisk' to 'untrusted_app', ensuring that excluded apps in the APatch configuration align with Android’s expected SELinux policies. This fix, implemented in Kotlin and leveraging expertise in Android development and system configuration, reduced the risk of misconfiguration and improved deployment consistency. The work demonstrated a deep understanding of Android’s security model and contributed to the maintainability of APatch by aligning its behavior with platform standards.