During a two-month period, Dktech200 worked on the crdroidandroid/android_vendor_crDroidOTA repository, focusing on Android OTA release engineering. They delivered the CrDroidAndroid 12.5 upgrade, integrating security patches and updating official build artifacts to ensure traceable, reliable deployments. In the following month, Dktech200 released version 12.7 for the Redmi 9A, addressing VoLTE reliability, display brightness, and fingerprint recognition stability. Their approach emphasized clear version control and single-commit traceability, using skills in Android development, mobile development, and JSON. The work demonstrated a methodical process, prioritizing stability and maintainability in OTA updates, with a focus on targeted enhancements and release management.