My ipod classic showed as hard drive but not recognized by itunes

Last time I was updating my ipod with iTunes, I forced the disconnection due to an error on the PC and now the iTunes doesn't recognize the ipod even if I can see it in the Device Manager showed as Apple iPod.

Already tried several ways to restore my ipod (factory reset, ipod test through factory menu, manually reseting hard disk use, reinstall iTunes, install iTunes to an older version, try to format ipod as an hard drive) but none solved this issue. Any idea how to solve this?

Thanks