Just to update:
Jens will not pay shipping to send the product back for repair, as it is costly from the U.S.
He also will not refund or adjust the price. Whenever money is mentioned, he stops talking to you.
Without his help, I cannot do much with it.
I know few people care to read this, but I am just posting for the record.
I would have a hard time buying another product from him, but I am encouraged that there are alternatives.