DX400 Factory Reset never completes

WD Legacy Products Sentinel Products
6

Hi,

I am trying to reinstall the OS by folowing the step to put the DX4000 into recovery mode.  I create a flash drive through the ISO file to recreate the OS, but receive “recovery fail 0XD9”.  I am stuck and can no more acces Dashbord, no more install a new PC and no more remote access.  Any Clue How I can go back to factory install.