The biggest issue with the BNO 881 today is that the original navigation DVDs are out of date. Roads built after 2008 simply do not exist on the original media. Furthermore, the factory manual (a printed booklet) is frequently lost.
This is where user-added manuals come to the rescue.
The BNO 881 is picky.
Why is the manual for the 7 612 002 064 so notoriously hard to find?
This is where the user-added manual becomes invaluable.
The keyword includes the term "updated" , and for good reason. Unlike a static factory manual, the community knowledge around the BNO 881 evolves as the units age.