In the release notes:
DIR-615 Revision B Release Notes
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Firmware 2.25b03 (Canada Only)
Date:01/08/09
1. Added QoS Engine.
2. Resolves issues getting online with Satellite Internet Service Providers.
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Firmware 2.25
Date:06/11/08
1. Added QoS Engine.
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I just updated to this new version and everything went smooth, but the date on the firmware is still: Current Firmware Date : 2008/10/30
So updated or not updated that is the question....