It may very well be that you are using a null modem cable. But I have had a failure to communicate problem with a straight through serial cable. The solution I found, suggested by the folks at Outlaw, was to shut the receiver down overnight (press the power button on the back). The next day communications worked fine. So you might try that before concluding that you have a cross-over cable. The other issue may be that you only have a few seconds from when you press the reset button to start the update. If you wait longer you get an error message. So get the updater running and select the HEX file before you press the reset. After resetting the 1070 immediately click to start the update.

Bob