Jochen, is there a way to figure that out? for example by logging the process while bmw is recoding the nav?

What I see when trying to recode the nav with navcoder is, that the screen (which is black as it is monocrome mode) somehow blinks (like it gets an reset command) but nothing is displayed on the screen. And booting the os cd afterwards, does not change anything. the nav reboots after upgrade process and still seems to stay in monocrome mode.