The Fenix3 will be on a 1.x VM - 2.x requires more memory, etc. Some of the 2.x functions have been moved back to 1.3 (and you use the 2.x SDK to build for 1.3).
Thank you for the answer. Is there any place where can I see the list of functions moved to 1.3 from 2.x? Or to be more exact, I am interested in difference between 1.2 and 1.3, (I found just list of supported devices, not list of changes).