I have recently encountered the error "upcase table is not found" on my SD card formatted with exFAT, after it worked just fine the previous day. No tool I tried on Windows or Linux could fix that issue, even though it seems rather trivial from my investigations.
After making a backup, I inspected the partition in a hex viewer, and what I found where hundreds of entries that looked like an upcase table (between position 0x10000000 and 0x106DFFB on a 400GB SD card in case that is interesting, see example below), almost every single one had some corruption in it though.
Can I somehow fix that through manual editing?
Do I have to mind checksums or any shenanigans?