I forget people do that. But eh. I kept my clean backups, so it's not a thing that worries me. But yeah @SomeGamer should make sure to remove any unsigned titles from his NAND, before removing A9LH. If he goes the uninstall route.If you have any unsigned titles installed to NAND, removing A9LH can permabrick your 3DS (you may still be able to enter safe mode but that's pretty much it) as they will fail signature checks.
Restoring a clean NAND dump is much safer in comparation.