I also have the MX-850. I get the same messages (Irout fail; iramp fail) with the partial and full downloads. It doesn't appear to affect the functioning of the remote.
Hopefully someone else can chime in on the problem.
Oy
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Sony KDS-R60XBR2
Outlaw 990
5 Outlaw 2200's
L/C/R speakers: Outlaw LCR
L/R Surround speakers: Axiom QS8
Outlaw LFM-1 Plus
Sony PS3
Toshiba HD-A3 HD-DVD
Comcast 8300HD DVR
URC MX-850