I have a X920BT with an activated MSN tuner and I just updated to the 2011 maps/930BT firmware. I keep getting the " system reset due to tuner error" over and over. It looks like the firmware does not like the old tuner anymore and does not gracefully ignore it. The unit is unusable since the error messages pop up every second and the on screen controls are locked while the popup is active. Bad, bad software design. I probably have to undo half of my dash to unplug the now useless tuner. So, be care when upgrading!

Update!

I just got off the phone with the Pioneer tech support. They told me to unplug the MSN traffic tuner. The new firmware can only handle the new ND-TMC-10. I still have to get behind the dashboard and find the connector though. I wish the software would be smarter ...

Good luck.