[solved] Problem with 2.hand MBL: Cant find it in the network, reset not working

here:  http://community.wd.com/t5/My-Book-Live/Replacing-hard-drive-in-My-Book-Live-NAS-Cloud-Storage/td-p/800767

it says the OS is on the disk, so I have to “debrick”  the drive first.

I did not think of that because I read that one can format the disk from within the UI and from that I concluded that the OS would be on the pcb… 

I´ll do that soon and I will report the outcome.