C&P from the instructions

Downloading Procedure for Digiwave DG6800/DG7000 Receiver

1. Connect satellite receiver to PC with RS-232C null modem cable.
2. Turn on the power of the satellite receiver
3. After upgrade software, open the Downloading Program.
4. Click OK
5. Waiting for the receiver said GOOD
6. Shutdown the power for receiver and turn on
7. You can using your receiver now
**** Do not interrupt the downloading until it complete *****

Note: Use regular RS-232C Null modem cable for downloading PC to Receiver.
Use RS-232 DB-9 Null modem cable for data transfer between Receivers
To Receiver