If you do a forum search you’ll find numerous threads discussing how to roll back to a previous firmware version. Most of those threads however cover rolling back the first generation v3.x/v4.x firmware My Cloud units. Its possible one may be able to use the same method used on the v4.x to roll back their v2.x.
One can find a listing of previous firmware and links to them in the following thread.
https://community.wd.com/t/wd-my-cloud-v4-x-and-v2-x-firmware-versions-download-links/148533
One how to roll back thread.
https://community.wd.com/t/easy-method-to-downgrade-to-previous-version-of-the-firmware/93489
