Get
EmuNAND9
Make a backup of your SD on PC
Put EmuNAND9 on your SD and run it through the HomeBrewLauncher
Create EmuNAND (full setup) -> Your SD will be wiped
EmuNAND9 will create an emunand partition and clone your sysnand to emunand
When it's done, turn off your System (right D-Pad + start)
Copy your backup back to SD
If you use Luma3DS, hold Select, then power on
You should be now in your linked emunand (same version as sysnand)
Now you can downgrade your emunand to 9.2
(see plailects guide for further info on downgrading)
Just be sure you downgrade emunand, not sysnand