Hello everyone, I'm using Galaxy J5 (2016). It's running fine 6.0, I've been using it for over 2 years. Last week my phone updated itself to Androi 7.0, the interface is pretty nice but it seems to slow down my phone. Wifi connection is very slow, the keyboard does not work, .. I want to downgrade software to version 6.0 how to do? Can someone show me?