I think it's a hardware problem.  Firmware isn't gonna fix it.
Return for a warranty replacement, otherwise, tap it a little more.  Tap (maybe a little firmer this time)....tap all over bottom side back, top.  Hold the blade,  hit with the handle.
I wasn't successful the first few taps. Tried switching from night to day, didn't work. Tapped 2 or 3 more times tapping all over, tried switching from day to night again, and suddenly (3rd try) from across the room I could hear it click when  switching !