for N3DS, DO NOT UPDATE IN SYSTEM SETTING!!!.
https://gbatemp.net/threads/tutorial-how-to-update-emunand-on-a-n3ds.393701/
From that tutorial, get Sysupdater, the cia version.
When you downgraded, you had the 9.2 files in the update folder. replace that with the 9.5 folder, then use sysupdater.
Alright.
So is there a chance of Sysupdater bricking my New 3DS when I try to downgrade, or is it safe? I downgraded my friend's old 3DS fine (after many, many tries) but I heard a lot of people saying things about bricks. But I also saw a lot of people saying they downgraded successfully, too.