Nah my SD's alright, I did try a brand new SD and had the same error show up.
The only thing that fixed it for me was turning the Switch off completely and turning it back on.
The brand is Samsung and I used gui format to format the card.
Also the sysnand worked just fine before and while updating, I only started getting this error after the updates reboot.
Did the corruption happen from the update files?
I've installed all the sigpatches and the latest version of Hekate (6.0.1 & Nyx v1.5.1) and my emunand boots just fine. I'm having issues booting my sysnand though, after the switch logo I get
error code 2005-005 0xa05
program 0100000000000000001f
firmware 15.0.1 something... I tried just...