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 !