I have been using Arduino IDE 1.8.5 on my macbook too upload versions of the https://github.com/SodaqMoja/SodaqOne-UniversalTracker-v3 sketch to my brand new SODAQ ONE v3 and up to about an hour ago that all went fine.
Now, when I upload, Arduino IDE 1.8.5 says "please select programmer". My selected programmer is "Arduino as ISP" and I have programmed the SODAQ ONE in this setup before (just 30 minutes ago). My SODAQ ONE shows up on port /dev/cu.usbmodem1411 and the IDE seems to think it is a Arduino Zero or the likes, but that didn't prevent me from uploading before.
I do not have an Atmel programmer at hand, I can only upload a sketch using the Arduino 1.8.5 IDE from my Mac and I have no idea what went wrong. I have seen one other user having the same problem on this forum, but there are no answers that would give me a clue as to what might be wrong.
I have tried to put the board in "bootloader mode" but the "Please select Programmer" error in the Arduino IDE remains.
Any tips on what I can try without breaking this expensive piece of kit?