Worked on modernizing APT repository management in the armbian/configng and armbian/build repositories, focusing on improving security, reliability, and maintainability. Migrated legacy APT source lists to the deb822 format and enforced HTTPS for all Armbian repositories, reducing supply-chain risk and streamlining package management. Implemented backward compatibility by restoring support for legacy armbian.list files and refined shell scripting logic to prevent unintended overwrites of third-party URIs. Updated documentation to guide future maintainers through the new workflow. Leveraged skills in DevOps, system administration, and shell scripting to deliver safer, more consistent repository handling across Armbian builds and configurations.