e-m10 how to increase brightness only for the shot?

I don't know if it is possible

Situatio: shooting in very low light, manual mode set to iso 1600 f/1.7 1/80s

image in the screen is pitch dark, AF locks (thanks to the AF beam) but I need to manual adjust and I can't because I can't see

is possible to make the camera increase brightness/exposition in order to make me see what I'm capturing on the screen but when I take the shot it reverts to the manual settings?

I hope my problem is clear