I am trying to download older firmware for my 998c and cannot make it work. I didnot realize until I updated HB firmware, that the DrDepth will not work with the new version....now I need to go back. I have been at this for two days and tried downloading almost all of the software from the download center. Most of the time the files will not transfere to my computer. On one occasion i got 5.4 to download but then when I put the card in the unit, it will not recognize and load the software. Anybody know what is going on?