I confirm: I recently bought this monitor model MAG 273QP QD-OLED X24, and when I updated the FW116 firmware to the DP port, Windows doesn't detect HDR support on the monitor (even though my old Redmi G Pro 27 MiniLED monitor worked perfectly in HDR mode via the DP port). On this monitor, HDR only worked via the HDMI port.
I'm using Windows 11 25H2 with the latest updates and an RTX 5070 card.
This is a firmware issue, as in the standard fw106 firmware, HDR functioned via the DP port.
I don’t know what to do, return it under warranty or is there a chance that the situation will improve with new updates?