Hi Luca Campanale,
About the new released library, I have install it, and check the release not, I find these information":
Supported boards and devices
TWR-K60D100M
FRDM-KL25Z
FRDM-KL26Z
FRDM-KL46Z
FRDM-KE15Z + FRDM-TOUCH
So, this new library should not support the MK20DX256VLK7, that's why I recommend you to use TSS3.1.
Wish it helps you!
If you still have question, please let me know!
Have a great day,
Kerry
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