Help! All data in mybook live gone and owner password unknown

[Bugs]

Is there a simple way to tell if the firmware is similarly defective on a first generation WD Cloud?

This post in the forum section on these devices says it may be affected:-
https://community.wd.com/t/does-my-1st-gen-single-bay-my-cloud-share-the-vulnerability-that-is-hitting-my-book-live-devices/268208

I can SSH into it but am not familiar with the required commands.