Thanks for the reply, norbim1
The STM32f411 has a different configuration, it is not an updated f407.
I made test with the board from my MidiSeq, which is an F407. I flashed, using STlink, the two files : p2_boot_1.11.bin at 0x08000000 and the p2_205o.bin at 0x08040000.
I also made some experiments attaching lcd pannels - one 4x20 and one 2x40, just to see some reaction.
Is there some step I am missing? There is noting on the LCD, should I wire all the wires and usb stick also?
I attach 2 shots with the flash process: