The following instructions are supplied by the manufacturer and extracted from the DTVS website.

With some channels being transmitted from a Sky transponder, the device may require a rescan to locate the transmission.

1. Press the MENU button on the remote.
2. Select "System Installation" and press OK.
3. Select "Factory Default" and press OK.
4. Select "Yes" when "Do you want to reset information?" and press OK
5. Enter the password. The default password is 0000.
6. The Initial setup screen should appear.
7. Select your location and press OK.
8. Select "yes" when asked "Do you want to scan"
9. The receiver will start searching the following transponders:
   a.12483 (TVNZ)
   b.12456 (Kordia)
   c.12644 (Sky – THE EDGE TV)
   d.12707 (Sky – Prime)
10. Once 12707 has been scanned, press the “Exit” button on the remote.

You should have all the channels.

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More resources from DTVS is available here.

Contact the DTVS technical support here.