Hi, I have a 3DS thats on 9.5.0 and I'm interested in the custom firmware. What would be my best approach to downgrading from here.
Just downgrade to 9.2. Ignore @thedark_
What ^ said.
If you update your system now, say good bye to CFW. Get SafeSysUpdater and use this guide.
+1Me and a lot of other users got errors when downgrading from 9.4 - 9.9, resulting in softbrick.
But after recovering to 10.3 it worked perfectly. Because OP only has one chance at this now, I'd definitely recommend upgrading to 10.1-10.3