How to customize a connectport x8

Hi everybody. Does anyone know how to customize a connectport x8 with firmware
Im reading the documment titled “Digi Device Customization and Integration Guide” but i can’t find what they say on my connectport x8.
Here is the link:
I need to customize the look and feel of the web design, and also make some changes in the data of the zigbee mesh network shown at the web interface.
Any help will be very appreciated.