Some of the following past discussions may be relevant.
One can, if they haven’t done so already, find more discussions on how to roll back or revert back to the OS3 firmware by using the forum search feature (magnifying glass icon upper right) and searching not only this subforum for the OS5 subforums (https://community.wd.com/c/os5/252).
Unbricking or trying to roll back to earlier firmware is always a risk. For some it works, for others it does not, or the unbrick process has to be run several times before it works. Common mistakes are people take short cuts or modify the directions, particularly the steps where one creates the partition sizes for the various hard drive partitions, because they they are using a different sized hard drive (or a new hard drive).
