Have you tried contacting the manufaturer for a firmware upgrade? Many settop manufacturers offer updates but you may have to call or email them first. The large first-tier manufaturers (Sony, Panasonic, Toshiba, etc) produce their own drives so updates are controlled by them. Some of the lesser known companies use off the shelf drives that can be taken out and flashed in your pc, simply because it saves $$.
You could open up the recorder and see what make/model drive is used,,,as long as you don't mind voiding your warranty.