I purchased a 921 yesterday (used). Its hooked up to my Dish 500 with a DishPro Plus Twin LNB pointing at 110/119. The signal strengths for 110/119 are 92/100 respectively. It works OK and shows the free NASA channel and a few others (I haven't subscribed it yet). But I'd like to get the software updated from L2.73 to L2.74. The power light has been blinking for hours. I checked the progress screen (Menu 6, 7) and it keeps going part way to 29 and then starts over at 1 (never gets all the way through step 29) It doesn't always restart at the same point. I have done a "check switch" and its OK. Also, I have tried taking out the DishPro Plus Separator and running 2 separate satellite cables to the receiver inputs. Still no L2.74. I've tried everything I know. Any suggestions on how to get it to complete the update?