Flash my module with Tasmota following the instructions described in this thread.
As has happened to other people, no relay responded.
The unknown chip, on my board is readable as 15w204, a microcontroller with 8051 architecture.
The purpose of this 15w204 is to learn the remote control keys, as I didn’t want to lose the functionality of the remote control, I didn’t unsolder the 15w204, I simply cut pins 1,2,3 and 4 and joined them with wires to pins 15, 14,12 and 7 according to @Robert Galleiso drawing.
Now everything works perfectly.
