From the same thread, perhaps a way to reset any Drobo password:
Please follow this procedure EXACTLY in order to reset your password:
Enter Username = reset
Enter Password = F4Iv2RdpyKt7HY2p
NOTE:
Windows: Ctrl+C to copy and Ctrl+V to paste
OS X: Cmd+C to copy and Cmd+V to paste
** Remember that both the username and password are case-sensitive.
Hold the CTRL key down on your keyboard and click one time on the Login button
Change your user name and password
Click OK
Go into Advanced Controls – Tools and Shutdown your Drobo FS
When all of the lights on your Drobo FS go out, toggle ON the power.
When the Drobo FS reboots and connects to the Drobo Dashboard, click on Logout.
Log back into the Drobo Dashboard with your new Username and Password