I just installed Firmware 5.50 on my Edge 830 yesterday.
First ride out after loading and calculating a pre-existing route which I have ridden previously with no errors, I get a "calculation error" within the first few minutes of the ride which freezes up the function. I stop the ride/route and restart it, I ride ~ 12 miles of the route and stop the ride. I set it up to go back to beginning of the ride along the same route. It recalculates and start the ride. Approximately 1/2 way back, the directions on the ride is having me turn the wrong way at intersections. Then ~ 1 mile later it says again something like "calculation error".
This firmware update has apparently broken my Edge 830. I have never had these "calculation errors" during a ride until this firmware 5.50 update. Please fix this and stop breaking things with updates. :-)
Thanks,
Nick.