I manually installed autostart plugin and it works well. Just needed to find how to download it. If someone else has that topic, here is the command:
wget http://plugins.volumio.org/plugins/volumio/armhf/miscellanea/autostart/autostart.zip
There is an installation guide for gpio plugin here:
Upgrade to Volumio 3 - GPOI plugin missing - #2 by M1ck
I did it accordingly.
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