Plug and play tuner issue

[cactikid]

Months back i replaced a working dvbc/t from aerial and inserted a sat tuner to make box a 3 tuner sat box.Unsure at that time if all had tuner lock and working.
when selecting automatic sat scan no sats are found so i replaced tuner back and saorview works.Reseated sat tuner and still not working.
New tuner arrived and inserted and same no signal.My 3 feeds work in the A and B tuners but not C.

I was told to reflash to a later image to see if it fixes it but unsure ?Cheers