CM: It will error out, you just need to keep trying cos its got corrupted somehow before. You dont know the history of the box so dont know whats been done before but if flash has got corrupted then just keep trying to erase till its successful, might take a few attempts. At this stage dont try to flash an image just erase from dreamup.
If you want the pli image I got let me know but you have got to get to erase successful first.
Are you using lappie or desktop, think remember you saying its a dedicated com port that right.