Following Smurphy suggestion, I’ve changed the “apple-silver-A1294-lircd.conf” as follow:
login on OSMC (from console or ssh):
cd /etc/lirc/
sudo cp apple-silver-A1294-lircd.conf apple-silver-A1294-2-lircd.conf
sudo nano apple-silver-A1294-2-lircd.conf
changed the line:
KEY_MENU 0xC0
into
KEY_ESC 0xC0
then exit
CTRL+X
Y
Enter
reboot
After reboot, go to MyOSMC and select Remote
Choose apple-silver-A1294-2-lircd.conf and confirm
After that, MENU Button resumes normal BACK operation.
Thank You All
Daniele