The USB memory stick is not recognized by the device, even after successful reformatting. What’s wrong?

AW: It may happen that the file system of the disk got damaged, or that the file allocation table of a data carrier is defect due to erroneous write cycles.
In such cases, you must format the data carrier again to make it work correctly.
Info: If the data carrier after formatting is still not recognized by the device, it may be due to an incompatibility of the disk controller chip itself. In such a case, you should use a different USB data carrier of another brand or manufacturer.