Nah you don't need to restore them. They're only needed as a backup in the event you're not able to restore your original NAND backup or you don't have one.Anyway, I have completed whole guide and successfully installed A9LH, but I got one more questions. For what are tickets? Do I need to restore them?
Latest section in this guide:https://3ds.guide/installing-arm9loaderhax
I had fresh 2DS with nothing installed. Should I restore them or I'm safe like that?