I had x2 prem v2 and deleted some channels. I think they were radio channels using the delete all function, then it said please wait and got stuck for 30 minutes, so I unplugged after waiting at least 30 minutes, and it rebooted to a black screen and would not respond to remote or front panel, just boots x2 screen then black screen. I then returned it and have since read on about 4 other sites about the same problem in the last 2 months. Everyone has tried restoring through serial and it wouldn't work. So that is at least a total of 4 different people that have had the same problem and reported it. I can't be sure if my receiver was tuned to one of the channels that it was deleting and then would reboot to empty channel.