(Different AndrewS than the one referenced above)

I, too, had the "Data Error" message which I quickly got past per the instruction to hit the master power switch off and on within one second in the upgrade documentation.

What hung me up was I powered back on after the upgrade but BEFORE doing the system reset. I tried hitting some commands from the remote, and now the remote doesn't work. My Harmony works perfectly with it - so I know it's not a problem with the 990, it's definitely a problem with the remote.

I haven't gotten around to calling Outlaw about it yet...