If you have a Mirror, the firmware you are trying to install will be incorrect. Even though the firmware is essentially identical, I think the installer has an identifier in it, and it will not match your Mirror.
The Mirror has two HDDs, and is therefore twice as wide as the basic MyCloud. It also has a pop-up lid. Does this sound like yours?
https://support.wdc.com/product.aspx?ID=907#WD_downloads
The latest firmware for the gen1 mirror is 2.11.168
So your MyCloud Mirror device firmware is up to date.
To further the firmware confusion, I have a vague recollection that the v2 firmware came from the Mirror and higher models, and they have always used v2 firmware. But different v2 firmware to that used in the gen2 models…
All very simple, isn’t it…?
