If you want to try and don't mind rebuilding, the following would be helpful:
- upgrade to latest OS (2020.1019.0007) by click-and-hold the second Check for Update button
- ssh in
- check
gdisk -Vsays 1.0.5 - run the commands from https://askubuntu.com/a/1058425
- run
shutdown -r nowthen move the drive to a windows machine and check you can access the dvr drive - reattach to the Pi and check it boots up correctly
If that works I will make it automatic.
I am also adding SMB support which will be ready shortly.



