I had an old version of MK4 software.
I have burned a V28 disc and insterted it in the MK4.
After a while the screen went blank for a long period.
I restarted my car and I got a changed screen (light blue) like an MK3.
On my screen, the Navigation menu is now vanished.
The power led of my MK4 is also down.

Can I do something to restore my Nav ?