Restoring your Switch to stock WITHOUT a NAND backup.
Procedure by Nevercholt Tech (https://www.youtube.com/watch?v=gVjF_MKjSv8) - transcribed by Karunamon
Note: This procedure is somewhat advanced and, if you screw up, you are likely to hard brick your switch. *Proceed with caution!
Also note that this is a full reset. All save data, installed apps, everything will be lost.