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Welcome!What Hardware version is your router? Look at sticker under router.
Link>What
Firmware version is currently loaded? Found on routers web page under status.
What region are you located?
There maybe a intermediate version that you need to upgrade first, i.e. v1.04 > v1.05> then v1.06.
I highly recommend only upgrading to what is officially posted on DLinks web sites.
What browser are you using?
Try Opera or FF? If IE 8 or 9, set compatibility mode and test again.
Try a factory reset, then try to send the file via LAN cable, then if it goes the, do one more factory reset then configure the router.
It's possible the new FW file is corrupt and not useable.