If you haven’t seen the following threads yet, you should take a while to read through them.
https://community.wd.com/t/clean-os-debian-openmediavault-and-other-firmwares/93714/
https://community.wd.com/t/synology-os-on-wd-my-cloud-new-hope/95650/
Please note that this is mostly a user to user support forum. You may not get the exact answer you seek simply because no one knows, or the people who posted previously on an issue no longer reply or participate in this subforum.
Replacing the firmware is NOT a simple task. There are risks involved up to and including bricking the My Cloud. Like it or not one will typically have to learn how to use various Linux commands in order to perform a firmware replacement via SSH. In some cases replacing the firmware is a trial and error method and the final results are often mixed since one is attempting to install firmware not designed for the WD My Cloud hardware.
