Typically, you would use the AirPort Utility to upgrade/downgrade the base station's firmware. Was this option not available to you?
To manually download and install current or earlier versions of firmware...
- Open AirPort Utility.
- From AirPort Utility menu, hold the Option key and choose Check for Updates....
- Select (place a check mark beside) the version you require.
- Click Download.
- Select your base station then choose Manual Setup from the Base Station menu.
- From the Base Station menu choose Upload Firmware....
- Select a firmware version and click OK.
I will try it now. Usually I don't use my software update to download the latest issues of things. I manually download updates from the Apple site and install it myself. I've read that it's a better to first shut off preferences, disconnect peripherals and other start up items first before you actually install. From what I understand, it's a more stable way to install things.
Thanks for your reply.
5.5.3 has been installed for a while now, thanks. And thanks for your install input. Did it like you suggested. Seems to be working fine. One last question...most software-related stuff seem to be able to be manually downloaded to one's own download folder via the Apple support section.
Does that not apply to airport firmware or something?
In the reference I provided earlier it mentions that the AirPort Utility keeps an archive of all of the base station firmware updates that you installed and stores them in the: ~/Library/Application Support/Apple/AirPort/Firmware folder on your Mac.
In this folder you should find at least two things: 1) A folder named 108, and 2) a version.xml file. In my 108 folder, I found a copy of the 7.5.2 binary file.
If you open the version.xml file, it will list all of the updates. In my case, I found the website link for the 7.6 update to be: http://apsu.apple.com/data/117/041-3382.20111110.RVred/7.6.basebinary. Opening this in the browser will download the 7.6 firmware binary file which you can then access using the AirPort Utility.