Hello Sir, We are currently using Gurux Director software to test a meter and have observed an issue with how the serial number is displayed in the Security Setup section, specifically below the "Server System Title" box. It appears that the serial number shown is derived only from the last three octets of the Server System Title, instead of the expected five octets. For example, the Server System Title hex stream is: 4B 5A 4B 00 05 0A 2F 7D (This corresponds to "KZK + 84553597")