Noobie here. I have tried to update my iMacPro Desktop to MacOS 10.14.4 and each time I do so it stalls part way through the update process and loops between Boot and Shut Down. Each time this happens my only option is to fully recover the machine from a full backup in Time Machine. All advice gratefully received.
I got it to load properly by entering Disk Utility and running First Aid on the HD (instead of going to the full recovery mode as I had been doing)and then when I rebooted it booted into 10.14.4 all AOK!!