I now have "fixed" my VU+ Uno that was flashed back to "OpenPLi-4.0-beta-vuuno-20141212_usb" after crashing on update described in start of tread. I did the following :
1: On VU+, in settings for HDD, I run the ext3 to ext4 conversion, this only takes a few minutes (Since latest OpenPLi do not read ext3 partitions anymore)
2: When finish I executed the backup plugin (that backup setting that is read after new flash)
3: I then flashed the box with "OpenPLi-4.0-beta-vuuno-20150102_usb" from USB
4: After boot, all works as it should. Did a online update today and all work perfectly !
In case this helps someone still have problems. Happy New year everyone !