I plugged in my proffieboard a week ago to flash some new sound fonts and changed a few config files, such as the buttons. When I uploaded this, suddenly the board was in an unrecognisable format for my computer, and one reset later I got three errors back-to-back and I have no idea what went wrong. I’m even running the newest OS in case that would help me but nada.
So, typically this happens when you fail to “remove safely” before unplugging or programming. What you’ll want to do is to format the sd card and put all the files back from a backup. If you take the sd card out and put it in an SD card reader, it will go much faster.
If you’re not sure if you have all the files or not, I suggest using a new SD card instead, that way, you can always try to rescue files from the current sd card at some point later.
Well, if it’s saying “SD card not found”, it might not be formatted correctly. For instance, it may be using a GPT partition table rather than an MBR partition table. I recommend using the sd association formatter, not because it’s the best but because it always formats the card in a way that ProffieOS can read.