Hi i have a similar problem
Copied some files from another switchs sd to my new switchs sd and then tries splitting a large file when windows complained about sd not beeing alright..
It ejected the sd While split program stopped. After that i get blue screen with athmosphere when i boot emu...
sorry, beein trying to find this file that's been right in front of me for a month now, only to find broken links, and google to prove that it's completely worthless.