Where to find latest firmware for internal drive "WD2004FBYZ-01YCBB1"?

I seem to have an old firmware version on this drive . I have an Enterprise internal SATA drive of 2 GB , model WD2004FBYZ-01YCBB1. I have firmware version RR03 but I know from friends that there is at least a newer version called RR04 or maybe newer. Can anybody send me this firmware ? Or a link where I can download the newest firmware . Thanks in advance

This same link is at the bottom right of this page.
Contact Support | WD Support (wdc.com) or try,

click Support at top of page.
Search Support | Western Digital

there is no recent firmware for this drive on the links. Only external drives.