Thanks for your answer.
This seems not be related to hdmi, I unplugged my cable, it did not change, but I was not using hdmi anyway.
Even flashing the passthrough has the same effect.
After having flashed the passthrough, the only thing that succeeds is "reset" and only with esptool, nothing seems to work with ampy.
All this seems related to the version of micropython; because when I flash back
esp32-idf3-20210202-v1.14.bin every works fine.
But my esp32-20220618-v1.19.1.bin has the issue.
I'd like to have something "more recent" than 1.14.
I am going to try some other versions.