For anyone having problems using SMB server, I solved in that easy way:
1) Activate SMB1 on Windows ( google it )
2) Go on settings ---> Net ---> Sharing, and activate all settings about individuation on the net ( I don't know how is called in Spanish but it should be easy to get )
3) Just right click on something you want to share with the m9702, even an entire HDD containing files, and press "Give access to"---> everyone
4) IMPORTANT: if you use a Microsoft account, just create a local account with a password and use it
5) From the m9702 you should see the PC with "images, music, videos", just click the one you need and than you have to insert the Username and Password of the local account created before. You won't need to put everytime these informations because you can save them
6) In this way you don't have to rename AVCHD, use programs ecc, just clicking the backup folder ( no difference if 2160p or 1080p ) and enjoy
This little guide works on the latest windows build.
One question: anyone tried if the image quality is the same using an external HDD or using the net?