During April 2026, contributed to the koreader/koreader repository by developing a targeted feature that enhanced OPDS compatibility through the addition of an alternative FB2 MIME type. This backend improvement, implemented in Lua, addressed cataloging and client negotiation issues by standardizing how FB2 files are recognized within OPDS catalogs. The work demonstrated a clear understanding of MIME type handling and OPDS protocol requirements, resulting in smoother ebook discovery and improved interoperability for users. Throughout the process, maintained disciplined Git workflows and adhered to conventional commit messaging, ensuring code quality and clarity. No major bugs were fixed during this period, focusing solely on feature delivery.