You did not start the setup process by selecting a language, I'm guessing.
I had the same issue, turns out your device cannot be unlocked when you don't get the 'Select a language'-screen.
FIX:
1) Reflash linux.img and salfishos_boot.img
2) Boot into Sailfish, hold device in portrait mode ('Esc'-button on bottom)
3) Wait a few seconds for screen to go black, hit 'Fn + Esc' (power combo)
4) It should now show the 'Select a language screen'.
5) Start setup from there, it will boot into Sailfish OS afterwards.
Lockscreen might still be a revolving circle, but it will be dismissable by swiping from the left.