I've bought this HTC One from one guy who had to change the display on it. It works fine but display has one problem. It has very high brightness and some buttons, icons and so on does not have the edges visible.
I tried to download some applications to lower the brightness but I haven't found one that worked perfectly. Some of these applications lowered the brightness and the situation got a little better but I couldn't set the brightness low enough with them.
I would like to ask if there is some way how to set the brightness or contrast manually via terminal in the operating system or this problem is more likely caused by bad display. Thanks very much for your answers (P.S.: I tried several Android ROMs, but no change occured).
Here is a photo of the display how it looks like (e.g. the black color is not black but silver. There are almost no visible circles around the ticks on the right side):