Yeah I would also reformat using guiformat to FAT32so wipe it again and only install atmosphere then slowly build it from there? Where do i get sig patches from?
UPDATE: Tried Downloading retrorch from HB Store and it crashes almost immideatly
Download the full zip from the retroarch link andextract it to your sd card
GUIFormat:
http://www.ridgecrop.demon.co.uk/index.htm?guiformat.htm
Retroarch Switch download link:
https://buildbot.libretro.com/stable/1.8.1/nintendo/switch/libnx/RetroArch.7z
Here's a link to the signature patches:
https://gbatemp.net/threads/i-heard-that-you-guys-need-some-sweet-patches-for-atmosphere.521164/