Install Debian on WD My Cloud home

Sorry, I think that you were talking about the duo. For restoring your firmware look in to the files from fox_exe (Clean OS (Debian), OpenMediaVault and other "firmwares") there you have instructions on how to restore your original firmware (the installer makes an automated backup, the files that you have with a backup extension are what you need), and if you use the installer of omv, you automatically get debian + omv, if you only want debian enter with ssh and remove omv with apt command. I don’t know if you are going to loose any data, I only have the cloud home duo and works in a different way (mine has 4 gb emmc where the OS resides, and the cloud home with one disk has the OS on the sata disk)