I dumped my NAND on a FAT32 formatted SD card, and verification failed. This took like an hour or two, so i'm wary of trying to dump again.
I also tried dumping eMMC SYS, where it dumps a whole number of separate packages, and the verification for most of these failed, too, usually at 2%-25%.
This is a new Switch on 3.0.0 and the only thing i've done on it is setting up HB menu with PegaSwitch, nothing else. Should i just shrug and ignore the v erification errors? Any wy i can verify them after the fact?
edit: BOOT0 and 1 dump and verify correctly, and PRODINFO and PRODINFOF do the same on the SYS dump, but all the following (the BCPKG2 things) all fail verification at 25-28%, and SAFE even fails veriffication at 1%.
(also it took me a while to figure out how to navigate the menu, since the joycons didn't work. You should jsut throw a quick note somewhere in the OP to use the VOL and power buttons, for newcomers like me)