I don't know password

Hello. I bought WD DS6100 on ebay, problem is I don’t know password ( they not give me that, long story ) , but I have preload system on HDD. Question how to reinstall new OS on system.?

I think you would be better off to reset the password. But eitherway, reinstall or reset password you will need the raid drivers and a Windows Storage Server 2012r2 Essentials ISO

two links below. one for raid drivers, one for password reset

Or this
https://support-en.wd.com/app/answers/detail/a_id/11467