What requirements apply to USB sticks when used with the SECUTEST?

The USB sticks must

• be formatted according to FAT32
• support the newer UASP protocol
• support the older BOT protocol.

In addition to the newer UASP protocol, the USB sticks used should also support the older Bulk-Only-Transfer (BOT) protocol.
As a rule, this is more likely to be the case with older USB 2.0 sticks than with newer USB 3.0 sticks.