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#18927
Harrumph
Participant

You should make a separate thread instead of asking here. In any case: no the vertical refresh cannot be adjusted by OSSC, what comes in is the same that goes out.

Looking at the manual, it seems this monitor will always reports this “not optimum mode” screen three times, if the resolution is not standard 1920×1080.

It is quite unusual for a PC monitor to not accept off-spec refresh rates, however in this case it might have more to do with incompatibility at the level of 480p signal only.
What you can do is try to adjust output into one of the other VESA formats, such as 1024×768 (use Lx3) or 1280×1024 (use Lx4). The procedure is described here: https://videogameperfection.com/forums/topic/tips-tweaks-lx3-lx4-lx5-modes/