Existing users, 
After the 2008-003 appeared in time for Europe to install via Software Update and realise it killed functionality and it was withdrawn before the US could suffer the same fate... Apple managed to fix its errors and release the 2008-004 Update.
This updates the Airport firmware to Broadcom BCM43xx 1.0 (5.10.38.9) but this time enables the 'n' functions the 2008-003 update removed.
No problems with install or update at all and after restart I even got my 802.11 'n' functionality back so I can use ADSL again via BT home hub (n) rather than having to resort to dial-up.
Recommended for Use.
... now if apple had release this instead of 2008-003 we would not have had anything to moan about! ;)
Apple AirPort Extreme Update
only for OS X 10.5.5 on Intel Macs
Version: 2008-004
Fixes Problems from 2008-003
Feedback Type: Review
Contributed by: man290663 Saturday, October 25 2008 @ 10:57 AM PDT
Product Platform: MacOSX
Used Product For: Less than a month
Recommend Product: YES
Overall Rating:
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Comments
Fixes Problems from 2008-003 - man290663
Refer to: http://www.macfixit.com/article.php?story=20081022231240408for details of the problems encountered with 2008-003 if you had no problems you are one of the lucky few..
Sunday, October 26 2008 @ 08:57 AM PDT
Fixes Problems from 2008-003 - JJJ @ versiontracker
what are you talking about???Installed 003 fine in the USA a few days ago.
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Saturday, October 25 2008 @ 05:16 PM PDT