The way i used my 5D2 to get properly framing , was to use the Zacutro Z-Finder Pro 3X , that passes thought to my
Atomos Ninja Hard drive recorder(which can be a monitor as well) . The Zacutro has different framing guide lines plus does
Anamorphic , be on that I my be the only left here that did research on the 5D2 Rom , the possibility exists but highly unlikely .
Its a matter of mirroring the liveview but the big differences here on the 5D2 you have 2 different Image streams
1 is set to 3x4 aspect ratio (HDMI with black pillar blocks) & the other (Video) is 16x9 or(1.85x9)
Now if we could get rid of the pillar blocks on the side , that would be 1 step closer to mirroring .
The graphic has to be redraw on both screen at the same time and i don't the D4 5D2 has a fast enough image processor .
I've done a lot Hdmi research about 5-6 years ago but ran in to a lot of brick walls .
The easiest way is to buy 5D3 , or the way i describe on my 5D2 .