Starting from 1.2.1, I can update my Audiomoth 1.1.0 units up to firmware version 1.3.0. Then if I update to 1.4.0 everything seems to go on fine but at the end I get: "No AudioMoth found". Config app does not recognize the unit either. I can flash to 1.3.0 again using the paperclip and then everything works. Note that 1.3.0 supports automatic switching to flashing mode, but I have tried with a paperclip as well.
The problem happens with all versions >= 1.4.0 I have to work with 1.3.0