We have the same Navigation database and map however my Device version is older than yours, you have the newer unit. I would only suggest trying the various speedcamera file versions people have already uploaded.
As you are getting the message "software update available" this means that the unit is detecting the initial config file (metainfo2.txt) on the root of your USB/SD, the problem is when it reads (this file?) and/or the other config files in the sub folders (MIB2DE, MIB2HIGH and MIB2TSD) as they contain the details of the files to use in this update package. Good Luck. Make sure you dont have any hidden files on the root of your USB/SD card.
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