Worked on enhancing the reliability and security of MFUL card access within the flipperdevices/flipperzero-firmware repository, focusing on embedded systems and NFC protocols using C. Addressed a critical bug affecting password-protected MIFARE Ultralight C cards by refining the page-reading logic to process and log only the relevant page, thereby restoring proper read functionality and minimizing exposure of protected data. No new user-facing features were introduced during this period, as efforts centered on targeted patching to maintain firmware stability. The work prioritized risk reduction for customers and deferred broader feature development to future releases, ensuring robust and traceable access control.