ok, I had to uninstall the tape  and media changer devices including to check to have the driver uninstalled.i then rebooted my server and Windows seems to see them all ok though it does list the media changer as unknown. I re-added the subsystem to my backup software and it seems happier.Now I just have to remember if I made any changes to that I need to reconfigure.I hate having to delete software/drivers, always seems so risky.  Don't understand why Windows couldn't just reconfigure what was already there since only the firmware changed.
I upgraded my Dell ML6020 to the latest available firmware. Tape subsystem indicates it is quite happy, but my Microsoft Windows server 2012 R2 states: Windows cannot initialize the device driver for this hardware. (Code 37) Object Name not found I can't find any current drivers, is there a solution or can I successfully downgrade by reinstalling the E6R0 firmware? This is important because I am not getting any backups till this is fixed.
Dell ML6020 LTO6 SAS tape drive firmware upg E6R0 to J450