The trouble with factory reset is that I believe it cancels out any off air updates, so use it with caution.
The tags for a lot of the old channels are still being broadcast, but a new channel search should put you as up to date as is possible.
The method for the Nokia is, I believe as follows, but only do it if you really need to, it has been known to lock up the box.
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1.Hold down standby key on the box.
2.With the standby key still held down press left arrow followed by right
arrow
3.Release standby key and "re" should appear in display. Press reset button.
4.Follow the screen instructions.
Beware though this wiil probably lose any off air updates.
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Rolf