I try to explain better me.
I have installed the software v 18.2.
At the end of the installation the nav shows to press ok to restart the system.
Just me pressed ok the nav is restarted with the display of == BMW==.
After the show of == BMW == it is restarted again until again to == BMW == and then it is restarted again.
In short it is restarted to the endless one.
I have tried to put a different software but it doesn't accept anything anymore.
The disk enters, he feels that it tries to read him/it, but later it is restarted immediately...
I know that my English is not good, but I hopes to make me understand.