Please post exact model number (there are several hardware revisions for DIR-615). The conventional upgrade method didn't work so I had to use the 'emergency room' method. The auto check says it is already up-to-date but according the the DLink website, there are a few more revisions available.
I suggest starting with these settings: DMZ disabled, SPI disabled, ALG disabled. Power up modem, wait for it to come ready, then router, then ATA. I used the instructions found at:-»forums.dlink.com/index.p ··· =13599.0Thanks again. This is a well known problem with this router and firmware version (and a few prior releases).
To do this, with the router already fully booted, press and hold the reset button for 5~6 seconds and release.
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You may have uploaded a file that is not intended for this Gateway, or the uploaded file may be corrupted.
If the uploaded file is correct, it is possible that the gateway may be too busy to properly receive it right now. It is also possible that you are logged in as a 'user' instead of an 'admin' - only administrators can upload new firmware. It seems especially weird when it shows up in the database that it is supported. It says in the database that it is supported however it points me to the DIR 601 firmware.
There may be new firmware for your DIR-615 to improve functionality and performance.