My Firmware Version is 3.00.04. I have two different "Legacy FTP Servers" (meaning not Thecus ones). Nsync works with one server but doesn't work with the second one. In the release notes of the new firmware there is a note about fixing Nsync problem with Legacy FTP Servers.
BUT.... In my case it works with one but not with the other. The question is - will an upgrade help in my scenario ?