08-11-2020 12:45 PM in
08-11-2020 07:52 PM in
Most often this indicates the corruption of the card itself. When Android encounters a read/write error on the card, it will re-mount it as read only, to avoid data loss by causing more damage.
Don't store important data on that card... and if you get this error even after formatting on a PC, throw the card out, and just get a new one.