I'm new to Vantage recievers and have allready come accross a problem. I tried to update the firmware on my reciever and it hang. It didn't wake up again, so I did a full upgrade with the latest firmware that I found (Vantage_X121SCI_00050011H-O060519a_full.hdp) and it woke up. But when I try to upgrade to more current firmware it hangs again. What am I doing wrong?