Hi ektor_s900,
Please answer the following questions first:
- Has this USB stick previously worked on your S710?
- Does the USB stick work properly on the computer?
- Have you tried other USB sticks?
- Has it been ensured that the USB stick(s) is/are correctly formatted (FAT32)?
- Does the USB stick show up in the "Function > Utility > Media" display in the "Device List" (usually as "USB1")?
Best regards,
Chris