iPod classic - restoring error 1675

Two months ago, I was perfectly able to listen to my old iPod classic. Yesterday, I got an error and a message that I should go to apple.com/support/ipod Here I am. I connected it to my mac and got this error: An iPod has been detected, but it could not be identified properly. Please disconnect and reconnect the iPod, then try again. An unknown error occurred (1675).

Can someone help me with this?