Interesting. I have one mini which I don't actually use. My firmware was 2.4.0

To update it I had to disable WPA2 on my Wifi, i.e. open it public, otherwise I was constantly getting an error during download. It went up to 3.4.1 then to 3.19.5761.
However I also updated my H20 to 4.12 and I quite like it. They finally did something with the ugly UI