flash disk must be established, all users need upload photos within this
folder.
4. while uploading, insert U flash disk into USB slot of the fingerprint
machines, scroll the "▲ / ▼" key to preview qualified photographs in U
flash disk, select the photos you need to upload. If you need to upload
all photos in the U flash disk, select "Upload user data."
5. When downloading, will be automatically built a folder called photo,
users can download all the pictures within this folder.
6. If you need to download all photographs in the machines one time,
select “Download user data."