@Jokeyman123
I formatted the card before inserting it into the piano, but it didn't work.
The piano instruction manual tells me to format the card directly from the piano itself, but when I try to format, I get the "Err Format" error.
I'm trying with other SD cards, less "powerful", hoping to be able to solve in this way, maybe it's a compatibility problem .....
https://www.amazon.nl/gp/product/B003TKB33G
https://www.amazon.nl/gp/product/B008RDCD20
https://www.amazon.nl/gp/product/B003QJWYDS
Here at page 61 of the PDF you can read that the manual says to format the SD card directly from the piano 🙂
https://usermanual.wiki/Casio/CasioCdp230ROwnersManual590472.272659782/view