Many people complain from their DVDs being unable to read home-written navigations. The problem is with the DVD reader itself and most specifically the lense. Factory-written disks are of much better quality than ANY of the home DVD writers thus in many cases the original disk the car came with (Europa 2007 for example) works but the new ones – don’t. The solution is replacing the lens of the reader.
WARNING: This is a delicate procedure and if you’re unsure you can do it – get someone who can to do it for you.
New part: I’ve ordered it from China – Aliexpres
If you’re purchasing from somewhere else – make sure it’s of the same type!
Now, here’s how to replace it. It’s fairly trivial procedure but you have to be careful.