As the title says. I basically never really planned on forfeiting emuNAND because I like an extra layer of security as well as the possibility to screw up, or reverting things I don't like easily. So after an A9LH + Luma install guide-style, I stuck to my 11.2 emuNAND and am keeping my 2.1.0 sysNAND. I'm happy with this because it unlocks some older style NDS flashcarts and because I don't plan on using the sysNAND in any way online. It's even unlinked. But let's say someday I want to sell my console or were to want to update for whatever reason. I know that on a new 3DS it will install the o3DS firmware and brick, and I know that on 2DS firmwares older than 6.0 would have compatibility issues. What about an old 3DS? The firmware was designed for it afterall. It seems to be working fine. Though I've not tried updating or resetting. Can I consider it as safe and as usable as a "legit" 2.1.0?