On 7.1 firmware and higher, we introduced an advanced security mode that is currently undergoing early beta testing. All devices must be using the same security mode in order to work together. If one device is not running the same security mode as the others, it will not communicate with your system.
For more information on Enhanced Security Mode, please see What is the COBRA Enhanced Security (EnH) feature?
A hardware 18Ms do not support enhanced security mode. To find out if your 18M is hardware A or hardware B, please see How do I tell which hardware version I have?
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