I was having problems with BenF 3.3 (I tried DfuSe with and without Windows NT pack 5 compatability and got the same result…the upgrade appeared to install and verified OK…but…when I turned the Nano v2 off then on again, it still booted up as SeeedStudios and not BenF).
downloaded the 3.62 version and now have BenF functioning.
Got the 3.62 version in these forums…thanks all who contribute to opensource
Black Beer rules !!