Greetings @Serghey,
It seems you’re running “Torizon 5.2.0-devel-202103+build.9”, or our March monthly build. I did some checking and it appears that we did have a known issue where HDMI wasn’t working after applying colibri-imx8x_dsihdmi_overlay.dtbo. This issue was resolved by this commit here: linux-toradex.git - Linux kernel for Apalis, Colibri and Verdin modules
However this commit was added end of March, which would be after the build you’re using. Could you try with a more recent build and see if that resolves it?
Best Regards,
Jeremias