In essence - yes
But it is a little more complicated. You need to make sure you have all the relevant firmware files.
Please PM me for further details.
Be careful though as you could 'brick' your unit...
Main: 861v4 (LPS),800v4,HD621,DSP6k,DSP5kC,DSP5k,C15 (QNAP),Apple TV,Sky HD,Cambridge Audio BD
Office: 800v2,504,557,MF MC2s,Mac Mini