Humax Foxsat HDR remote response / Deleting lots
As well as making sure you have removed both films from the front panel (there is a second one behind the flap) look to see if you have one of the models which has the coating all the way across with no clear hole left where the sensor is. If so you can scrape the coating off in front of the sensor to significantly improve the remote response.
To delete lots and lots and leave it to chug away move all recordings to be deleted to one folder (or to the top level) then Select All in that folder then Delete. Time for lunch.