I am having same problems what I did was Factory Reset deleted BMW, Benz,Benz Sprinter, Audi, and all VW cars software than started to install first BMW as BMW software is the most big software with at least 8gb and finished with rest software and now I only have 2gb memory.
Also make sure you delete all the picture, history logo files, also go in to download folder and delete software previously downloaded, or all of them........
(You only do this if you still have a valid Update Sub) if not don't do this)
Hope that helps