Thanks to Katers2 got the WIFI dongle working (D-LINK DWA-140 rev. b1).
I have two issues:
1. The TV reboots when CIFS shares are not available.
2. There is a problem with reliability. When playing a movie shared with CIFS it stops after a while. It seems like the USB stick turns off. Maybe the USB hub does not provide enough power.
I wonder if it would be possible to have the hack on the rwarea of the TV so I only need to plug the WIFI dongle.
Any suggestion to solve the issue when CIFs shares are not available?
In my other (C7'000) this rebooting issue does not appear.
All the best!,