from TFT Central:
How to Find the Firmware and Panel
As a reminder, Dell screens allow you to access the hidden ‘factory’ OSD menu to find out some additional information about your screen. Here is how to do it, it will become important later on…
1- Turn off your screen
2- Press simultaneously the 'Menu' and '+' button of the screen.
3- While holding the 2 buttons, press now the 'Power' button.
4- Once the screen in ON, unpress the 3 buttons.
5- Just press '-' button.
ako ti na vrhu piše RT803 onda imas S-IPS ( probably
)