Sorry Selector. Didn't realise your box is a HB-1100S as woodbutcher said use the link for the HB-1100S. But it's strange the instructions says to hold down the channel button if your box doesn't have buttons. I would contact Humax telling them there instructions are not correct.
Woodbutcher I'm pleased you have fixed your hd. If it goes again spray the cable and sockets with electrical contact cleaner.