I have upgraded my STHD 8800 and have one error.

When upgrade show this:
Download All Chunk
Burn Flash, DO NOT power off!
->Error:No Packet receive!
in execute command:burn
Retry.....
->Error:No Packet receive!
in execute command:reboot
Retry.....No Packet receive!

How to unbrick this?.
I have tried to upgrade and the receiver is bricked. How to unbrick? any idea?.