While waiting for N3DS support, I'd like to continue some of my old Gateway saves on my brother's OG XL console that's been downgraded to 4.5. Problem is my saves were created on 9.2.0. If I update his console to 8.1 using his Smash Bros. cart, will I have any trouble accessing Gateway mode, and is it safe? He already has the web browser updated, so I don't see that being an issue.