Just wanted to share what happened to my switch recently and wondered if anyone could help?
I updated to 11.0.0 at the start of December and then updated to the latest SXOS so I could play the new Doom.
Once it was all done my switch would no longer recognise the micro SD in either OFW or CFW...
@Xdqwerty, Osu! Tatakae! Ouendan! is the Japanese version of the game, different settings/characters/songs but otherwise identical mechanics. I played that before I knew about Elite Beat Agents lol. Both fantastic games https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan