I have a legit copy of Super Smash Bros, and want to play it online. So I wanted to know if I could just update my 3DS (New 3DS XL 2015). My 3DS is currently on 9.0.0-20U. I know there's a downgrade option available for the Gateway, as long as you make a SYSNAND backup. Would downgrading have any downsides to it? Will it work with any FW?