Your log said
Untar: tar xf /media/hdd/images/vuplus/uno4k/rootfs.tar.bz2 tar: write error: No space left on device write error: No space left on device Error flashing rootfs! System won't boot. Please flash backup! System will reboot in 60 seconds
It complains about space left on device It looks like this was the issue
https://github.com/oe-alliance/ofgwrite/commit/d5d5666291c5afa5e12a18702917d68ff29b9185, although I can't tell what they was trying to do then I had the same issue on 5.2.019 even though you and others said it was fine on vix so it seemed to be random box/image issue
That commit was removed so it should be fine on future images
