Apple has released a firmware update for the 2009 Aluminum Apple Wireless Keyboard that improves battery performance when using them in conjunction with other Bluetooth devices such as the Magic Mouse or some Bluetooth headsets. Apple notes that your keyboard must be connected or paired to be able to perform the update. More information regarding installation instructions is available on Apple's Web site. The update is available via Software Update and the Apple Support Downloads page. (Free, 1.14 MB)
Find Your Mac's Serial Number
Want to check your Mac's serial number quickly and easily? Select About This Mac from the Apple menu, and click on the text directly below "Mac OS X" that reads "Version 10.x.x." Click once and you'll get a build number which is more specific information about the software. Click twice, and you'll get your Mac's serial number.
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2009 Aluminum Keyboard Firmware Update 1.0
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Attempted to install this update on a brand new aluminium wireless keyboard that came with a brand new 21.5-inch iMac. Keyboard was 'stuttering' by repeating random characters without being touched. Firmware version in System Profiler indicated keyboard update was necessary. Bluetooth in System Prefs shows Keyboard is paired, but Firmware Update reports no keyboard. Tried another brand new aluminium keyboard from a recently purchased 27-inch iMac, same result. (Yes, I am in Sydney, Australia, where we spell it aluminIUM).