How do we reverse the problem caused by the 10/21/08AirPort Extreme Update

I installed the update yesterday on my iMactel and I can no longer turn on AP from the menu bar. My printer is plugged into an APExpress so I can't print. Thank goodness my iMactel is connected to the modem via ethernet.

The problem is that the 'AirPortExtremeUpdate2008003.dmg' updated the AirPort card firmware to 'Broadcom BCM43xx 1.0 (5.10.38.9)' (might be different depending on which card you have) - as far as I know, this is irreversible and even a 10.5.x clean install will not fix.
1. Repair Permissions - /Applications/Utilities/Disk Utility.app. Start Disk Utility, select your HD and click on Repair Permissions. When finished, quit Disk Utility and then restart your computer.
2. Copy the following System Preferences Files to your Desktop (HD/Library/Preferences/SystemConfiguration):
- com.apple.airport.preferences.plist
- com.apple.network.identification.plist
- NetworkInterfaces.plist
- preferences.plist
3. Delete the above preference files from HD/Library/Preferences/SystemConfiguration - you will require your administrator password. Shut down the computer.
4. Safe Mode Startup - hold down the Shift-key at startup until you see the login screen. When logged-in, then go to System Preferences/Network/AirPort
- click on the 'Network Name:' roll-button, select 'Join Other Network...', enter 'Network Name and select the security type you are using, and finally, enter your Password and click 'Join'.
5. Click 'Apply', then exit System Preferences and shutdown.
6. Startup normally and check your AirPort preferences.
Your System Preferences will be rebuilt - if everything works OK then delete the preference files you copied to your Desktop.
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