Hi,
I can't answer your MFMT question, but part of your confusion is that there are several similiar versions of the DNS-320, the A1, A2, B2, and the newer 320L. Your first step is to check the small tag on the back or bottom of your unit and make sure which version you have. Then the easiest way is to go to the DLINK support site for your country or region, do the product, downloads and you will likely find both the most current and older versions of your firmware for your version. There is often a link for the most recent beta version available from this forum, but you have to be sure it's for your version of the 320. If not, it probably will fail on install, but...you could possibly damage your 320, so get it right. Also, before just updating, read the change log, many folks have updated and then discovered something they needed is now broken. Check the comments of other's in the appropriate sticky on your forum. Oh, by the way, a device with 1.xx firmware is generally not going to work with 2.xx firmware. Good luck