SOLVED!
Talking with Andy (official IPAC reseller) he told me that every IPC configuration file must be set with all keys or all pad buttons, no mixed.
Did a rapid check: IPC pad file was ok, all pins was set to pad buttons (also unused pins), no key. ------------> IPC keyb file had a pad button on a unused pin <---------------, so , when i tried to change from mode xinput to mode keyb via IPC file, didin't work for this reason
Corrected IPC keyboard file, editing the unused pin, correctly set to a key button (not important which, because it was an unused pin) and then it WORKS !
Now, next step is, doing a script, but for this, i will open another topic
