inside battery cover, there are 2 holes, you can see printed on board something like VF1 or VF2, i dont remember what is the names exactly
better doing with the console open and not through the holes since you can touch somehting accidentally and break a fuse just like i did (or worse)
anyway, not sure which is for which screen but thoose things are like screws, you must rotate them with a screwdriver until you find the right position
try to be carefull and don't over turn them, it can fry the screen
i will try to take a picture and show you what i am talking about
View attachment 20576
click on the picture for zoom, see the red circles? they are the screen regulators.. you must tweak them (not sure which one but you can rotate them a bit to see which screen is changing... just try to be careful...
and as i said, i reccomend you to do it while the console is open, or try to don' touch anything..
for install flashme i had to make a connection on the hole in the left (the one after the regulator) and while blindly sticking a screwdriver on it creating short circuit... i blew up the fuse..