Official instructions here
If you're asked for a password or PIN, the default for the PVR80 is 0000 (zero, zero, zero, zero).
Step 1
Press the Menu button on the remote control. Use the down arrow to highlight 'Setup' and press 'OK'
Step 2
In the Setup menu, select 'installation' and press 'OK'.In the Installation menu, select 'Automatic channel scan' and press 'OK'
A box will pop up. Select 'Yes' and press 'OK'
If you've lost BBC1 and BBC2 after the 4th November rescan, follow
the update instructions
If you use the Winter Hill transmitter, you may need to do a manual scan of channel 62 (after the upgrade) in order to get the BBC North West programmes instead of BBC Wales.