I just went through this! I posted on Reddit but nobody helped. I made an account just to share what I figured out!
I also have an old OG switch that I only use SYSNAND on. You can restore using NxNandManager. I had both the NAND backups and prodinfo.bin. I never found a way to use the old...
Caller -"Everytime I start a Pc game on my S24, playing on a external monitor, someone calls or texts me, n it kicks me out of the game." Customer Support - Click (hangs up)
I found it funny cause many many years ago, had a roommate in college that did this same dumbass branding of the school logo, but it didn't look anything like it after it healed. Just looked like a birthmark.