HDMI -> DVI to old monitor

I have to connect the Bpi-M2 through the DVI. I have a HDMI <-> DMI adaptor in order to connect my board to the monitor.

I followed this guide :

but it doesn’t work with my old monitor. I think it’s a question of frequency refresh that is not compliant with the monitor. The same settings worked fine with Banana Pi.

Can you suggest how to fix the problem ?

Regards, Claudio