This is the latest system update for the AT-900 and AT-900C. Please refer to the "AT-800_900_900C README.pdf" document included in the download for the update procedure.
NOTE: The update files that you download and save to your computer from the link above are enclosed in a compressed zip file. This file must first be uncompressed. You can do this by using the WinZip application on your PC running Windows XP, or by using Stuffit Expander on your Macintosh (needed for OS 10.2.x or below). If you're using Mac OS X 10.3.x or above, then you will not need Stuffit Expander.
When you double-click on the downloaded file that you saved to your computer, WinZip or Stuffit Expander should startup automatically. If you do not have WinZip (PC) or Stuffit Expander (Mac) installed, then you must download it, install it, and extract/unzip the update files folder before you can complete the update procedure.
You can get WinZip from the following link:http://winzip.com
You can get Stuffit Expander from the following link:http://www.stuffit.com/mac/expander/