Double-check the Device ID (usually 1) and the IP address. In this older version, the PC and the device must be on the same subnet. Should You Upgrade?
If the software won't connect to the device, check that Port 4370 (the default ZK port) is open in your Windows Firewall. Common Errors in Build 130 zk attendance management 2008 ver 371 build 130rar link fix
When searching for the zk_attendance_management_2008_v3.7.1_b130.rar file, avoid generic "driver update" sites, as these often contain malware. To fix a broken download link: Double-check the Device ID (usually 1) and the IP address
Ensure you extract the entire folder structure, not just the .exe . avoid generic "driver update" sites
This usually means the SDK (communication components) didn't register. Go to the Bin folder in the installation directory and run Register_SDK.bat .