Your base station must be in hard reset mode to follow these instructions. If you have not already reset the base station, see technical document 106602: "
AirPort Base Station (Dual Ethernet): How to Reset"
Follow these steps to upload software to the AirPort Base Station (Dual Ethernet):
1. Connect a computer to the LAN port on the base station with an Ethernet cable. Either standard or crossover type cable will work. The connecting computer must have the AirPort Admin Utility 2.0 or later installed.
2. Choose Control Panels from the Apple menu, then TCP/IP from the submenu.
3. Choose Ethernet from the "Connect via" pop-up menu.
4. Choose Using DHCP Server from the Configure pop-up.
5. Close the control panel, clicking Save if prompted.
6. Open the AirPort Admin Utility. There may be a slight timeout delay while your computer determines that there is no DHCP service available and assigns itself a default IP address in the 169.x.x.x range.
7. Click Configure. You should then see a message that says: "The base station you have selected has been reset and is currently not configured."
8. Click OK.
9. After the AirPort Admin Utility reloads the software, you may perform further configuration or quit the application to use the base station in its factory default state.
Note: Wireless Internet access requires an Internet service provider (fees may apply) and AirPort (or AirPort-compatible) wireless Ethernet card and base station. Some ISPs are not compatible with AirPort. For more information, see technical document 106590: "
AirPort: Requirements for Wireless Internet Access"