After the update everything on my Lumia 520 is smaller and sharper. Did the font size has been decreased or the support for higher resolution was added? I couldn't find the screen resolution in the settings. Anyone with me"
you probably mean that the font size changed..you can rechange it in the ease of access in settings..the actual resolution of the device can't physically be change
It's very unlikely that the resolution would go up, since it's a matter of hardware. It would also be new to me that you can change the resolution manually, there is no setting for that on any phone.
However, you can change the font size manually in the settings but it should already be set to the smallest size.