I disconnected the 15 and 16 pin of the HDMI connector.
these are SDA and SCL signals
I2C bus via which EDID is transmitted
Now the board does not know which display, and it uses standard resolutions of 640x480 800x600 1024x768.
Now the image is from the beginning of the download, the picture is normal. I change resolution, all avalable(standart) resolutions good work.
But there is no sound.
As far as I understand, the board thinks that it is connected to a simple monitor, without speakers and the sound is not transmitted to HDMI.
Now it’s clear why the image appeared on the screen when I replaced the dbd file. I think the i2c bus stopped working .. and the board started up in standard resolution ...
all this is very sad...