my problem is the following: I have bought a Blend Micro and followed all the initial steps as suggested in the "Getting started guide" (http://redbearlab.com/getting-started-blendmicro), by adding the folder "hardware" in the Document/Arduino folder. I could not see any Blend in the Board Managers.
As soon as I tried to compile an empty script I receive the error that the file "boards.txt" is not found in the folder \Documents\Arduino\hardware\blend\bootloaders... but actually this file exists in the upper folder (blend), so I have simply placed the file in the "bootloaders" folder. So, I could see in the Arduino Board Managers I can see 3 voices: Blend, Blend Micro 8MHz & 16Mhz.
So, then I tried to compile again an empty script and what I got is an erro saying that "The selected board require 'arduino:arduino' core which is not installed." I tried to update all the libraries and boards, but nothing (I have the last version Arduino 1.8.1 on Windows 10).
I don't know what to do, please help me
Thank you very much!