@Ivano 

For your information, the TD-W9970 does not support SMB v2 yet. While this feature will be added in the near future. 

Here is the solution for your to access the USB devices connect on our router.

a)      If you do not want to use SMB 1.0 anymore, you can use FTP to easily access the USB memory on your TP-Link router using the Internet browser. Alternatively, you can also use the FTP protocol with e.g. Cyberduck, FileZilla or WinSCP access the memory.

b)      You may also continue using SMB1.0, please enable SMB 1.0 support on your windows 10 computer follow these steps：

1. Enter sys in the search box of the Windows taskbar and then select "Control Panel".

2. In the upper right corner, under "Display", select "Category" ().

3. Click on "Programs" and then on "Programs and Features".

4. Click "Turn Windows features on or off".

5. In the Windows Features window, enable "Support for SMB 1.0 / CIFS File Sharing" and click "OK.

6. Click "Restart Now" to complete the installation.

Sorry for all the inconvenience and your cooperation will be highly appreciated.