I'm trying to upgrade my Pix 515e, ver 6.3.1, to PDM 3.04. According to Cisco I need the DES activation key and the 3.0.4 software. I have the activation key, however, when I try to upload the PDM software, I get an error message "Not a PDM file" then deletes the partial loaded file. Cisco recommended to use a different TFTP software. I did and I'm still getting the same error message.
Any help is welcome.