How do I install a stock rom on my HTC M7 ITA with S-ON?

[robertoneo]

install stock rom on HTC M7 ITA with S-ON

Hi guys, I need your help: I tried to install a custom rom on my HTC One M7, but without turned S-ON to S-OFF, now I can turn on my device only in bootloader, but I need to re-install the stock rom, or any other custom rom in order to fix my smartphone.
There is any one who can help me??
Thanks a million in advance
Roberto