During December 2025, Levizh focused on enhancing the stability and reliability of the levizh/rt-thread repository, working primarily with C in the context of embedded systems and file systems. Levizh addressed two critical bugs, first resolving a concurrency issue in multi-threaded file operations by ensuring the lseek return value was correctly preserved using a local variable, which improved the robustness of file handling. Additionally, Levizh fixed a build-time error in dfs_elm_unlink by correcting the assignment to dentry->pathname, ensuring compatibility when FF_VOLUMES is set to one. The work demonstrated careful attention to maintainability and correctness in complex, concurrent environments.