We can change the LED behavior to whatever we like. How it worked before in NETMF is not related ot how it is today with TinyCLR OS.
By the way, someone made this video with a blinking LED on netduino3 https://youtu.be/6UCjEHaMSB0
yes, the blinking led was sort of "hello world" application
I tried to connect it to 2 more computers running Windows 10 x64 (that haven't "seen" Netduino before) with the same result where it could not install drivers.
Is there a way to verify something via "DFU Tester" application?