Just got a Switch with appropriate serial #.
Booted with SX OS, jig, USB stick. Realized Switch is running 7.01. SXOS 2.6.2b.
Backed up SYSNAND to 32GB SDXC, Fat32. Put that aside for safekeeping, and made a copy in a few places. Zipped it.
Ran the emunand copy to a 128GB SDXC, Fat32...