its not a sdcard reader problem. try using another SDcard.
you just need a clean sdcard.
format the sdcard using windows,use defaults configs format and just copy Kosmos v11.7 ,ChoiDujuorNX and your Firmware 6.2.0 files to your sdcard.
-just power off your nintendo switch,
-extract your...
yo guys the sonic x shadow generations trailer dropped today, and shadow just straight up decided, and i hate (love) to bring this dead meme up, but, it's morbin time