I tried updating my Rossini from 2.00 to 2.01. First doing so via the Android App. Next via a Windows 10 PC browser interface. That too failed.
I then turned off the Rossini and unplugged it. Turning it back-on and after downloading the update via the Chrome browser 192.168.1.XXX interface, this too failed per the attached screen clipping.
BTW, I should add that the Rossini is working quite well with Roon (running a Core on my HTPC). Also, the Rossini is connected directly into a 24-Port switch and that to a Uibquiti USG-Pro-4 Router and my personally-owned Motorola modem.