I don't view these channels often but noticed recently they just show as scrambled or unavailable. From my own searching it seems the frequencies were changed, is there anyway to update the box? I've tried the retune option, it goes through the motions but makes no difference.
It is an old unit the diagnostic page says "update Date 27 Jul 2012"
When checked there are no new software updates available.
Humax Foxsat-HDR
Software ver. HPRSFCI 1.00.21
Loader U 7.53
System ID 3768.0000
thanks
Using 28.2E Sat in UK and we have the exact same issue with our old Humax Foxsat-hdr (July 2012, HPRSFCI 1.00.21, U7.53). Symptoms started within the last week or so. Selecting channel names starting with "U&" (156-160) just gives "The channel is scrambled or currently not available". All other channels seem fine. Tried re-tuning the box and it find 147 channels including those "U&" channels and says signal strength is around 100% but you cannot view any of those starting "U&". I did also notice the guide's times were completely wrong as well but after a few days that seems to have sorted itself out. I haven't tried a factory reset, as yet.
The U branded channels made a change to the way their programmes are encoded about a month ago (they were MPEG-2, now MPEG-4).
A rescan alone doesn't fix this, but one way to re-establish them is to delete the affected channels and then rescan.
Not in front of my set up at the moment, but the steps are something like this.
Menu, Edit channels, Edit Channel List
Locate all the 'U&.....' channels and delete them.
Save the changes.
Menu, Set up, Freesat tune
Any scheduled recordings on the U& channels will need to be reapplied.
Thanks very much Dino. I'll give that a go and post the results here.
Brilliant advice Dino!!
Removing the channel names starting with "U&" and then re-tuning worked perfectly. Saved us spending £££s on a new Freesat box or replacing the Panasonic plasma TV with modern 'smart' TV - with all the privacy issues associated with that 
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