Possible to downgrade to Lion on 2011 Mac Mini?

so got core i5 mac mini in august of last year. been computer, having issues lion. hamachi/logmein vpn server doesn't work few other programs. in attempt downgrade snow leopard inserting retail snow leopard disk external dvd drive, kernel panics. genius said due firmware can't downgrade?

 

as far know, correct!
can downgrade if mini came installed snow leopard.

 

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