The firmware is the operating system for this hardware. It dictates how the panel processes a card swipe, how it communicates with the server, and how it reacts when the network goes down.
Access control failures are security failures. Treat your firmware update process with the same rigor as your physical security protocols. For further assistance, consult the official Hikvision DS-K2604T user manual or contact certified Hikvision technical support with your device serial number and current build version ready. ds-k2604t firmware