LibreELEC 8.0.0 RPi2 no 50Hz

Hi,

I’ve a RPi2 with LibreELEC 8.0.0 and in system settings>display I only have 59.94 and 60hz refresh rate no 50Hz.
I also have a RPi3 with the same SW and I have the 50Hz option, in reality also in the Resolution the RPi3 as 16 options and the RPi2 only DESKTOP 640X480p 1280X720p and 1920X1080p (Samsung PS50C7000).
In the player settings I have the Adjust display refresh rate set to Always in the RPi2 the resolution is adjusted but the refresh rate is stuck at 60hz with the RPi3 everything ia adjusted.
How can I enable the 50Hz resolution?

Thanks in advance