The old device supports only WEP. WEP is an insecure protection and using WEP could allow your network to be compromised, so WEP is not included as a valid security option on the IFWA-40. If possible, you should update your device to support the latest WiFi security standards. If that is not possible, you can disable all WiFi security and your device will connect. This will also allow others to access your network, so this is not recommended.