I have Vu duo2. I installed from crash the latest image OpenBH 37 and I am still not able to update the image. I used the telnet command to update and no success. All time I have 79 paquets available after the update.
regards
https://www.vuplus-community.net/board/threads/openbh-4-3-vu-duo2.39485/
The latest image is Open Black Hole 4.3, where you're posting. Are you doing a full re-flash, of 4.3, and not using any backup?