From V4b5, made config backup, upgraded to V4 Final (no HD version)
Choose language (Dutch)
Load config backup, language is in Cyrillic (Greek Russian whatever.....)

what the

Finally remembered which tab was the language tab, that problem was solved.
At last, coffee and an episode to watch....
$#% no NFS response.....
My NFS paths are ok, but no response, no spinning "8" nothing, only a blank screen with the "go back" arrow.
The strange thing is that wen I press the Return, it goes one level up in my NFS link, and doesn't returns to the media selection screen.
192.168.1.11:/mnt/HD_b2/series/
Press Enter -> blank screen, only "go back" arrow.
Press Return on remote
192.168.1.11:/mnt/HD_b2/series/
Press Return on remote
192.168.1.11:/mnt/HD_b2/
Press Return on remote
192.168.1.11:/mnt/
Finally my coffee is cold, I regret to upgrade before watching my TV show....
Flashed the firmware back to V4b5, loaded my config backup, no problems at all....
It's too late for figure this out, a lot of my family got a mede8er on my recommendation..... It's a pity that there's always a catch somewhere when you flash a firmware, final or beta....