To be honest I almost fucked my life up lol. I actually hit restore sysnand without hitting keep a9lh and it installed base max updated sysnand but I quickly realized that and DIDN'T POWER OFF THE 3DS. I unmounted the SD and threw my stock 9.2 with a9lh in on it then imported my 11 fw emunand as systemnand and hit keep a9lh. Bricks were shat lol
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And that is the reason I always recommend using Hourglass9 instead of Decrypt9 for A9LH NAND dumps and restores. It gives no option to do non-A9LH restore, meaning you can't accidentally restore and overwrite A9LH. I only use Decrypt9 when it doesn't involve needing to restore NAND.
After restoring emuNAND to sysNAND, you need to hold select at boot to reconfigure Luma, making sure you at least have "Autoboot SysNAND", "SysNAND is updated (A9LH-only)" and "Force A9LH detection". I also recommend enabling "Show current NAND in System Settings" and "Show GBA boot screen in patched AGB_FIRM", but those aren't necessary.