In some cases, you still need DVRupdate, even if not crossflashing ... not sure if the official 109 updater doesn't work on OEMs, or doesn't work on some IDE chipsets, but I had to use it for a non-crossflash DVR-109 (1.09) to 1.55 - having watched 1.40, 1.50 & 1.55 go by with ZERO response from the useless OEM ... the best they had to offer was 1.17