Miles and More is a total rip off there customer service center in California is staffed by nothing but idiots and assholes one in particular is Monica. She is supposed to be a supervisor and is a total bitch and idiot.
The scam is they make you use 50K miles to upgrade and they will not confirm the upgrade until you have purchased the ticket. So they can tel you they have the upgrade space and then you buy the ticket and have to cal back to the M & M service center to find out there is no upgrade and no refund on your ticket.
British Airways is much better only 25K to upgrade and confirmed at time of booking.
If anyone at Lufthansa reads this fire that IDIOT Monica.