S-OFF- a term used by HTC to indicate no partitions are secured. HTC does not ship devices S-OFF due to regulations and dangers related to radio software being changed and other issues. HTC devices ship with S-ON status
such as the one that holds radio software or the one that determines if the device is S-ON/S-OFF. Please reference the Unlock process overview herefor additional details.
To flash a ROMs or partition data using fastboot on a new device like the HTC One, you would follow these steps:
1) Turn the device off: Start your phone’s Settings. Enter the Power section. Make sure the “Fast boot” option is not checked. This option prevents the device from fully restarting. Unplug the device and hold down the power button approximately 15 seconds until the button lights flash. This completely powers down the device.
2) Start the phone in bootloader mode: If your device started booting automatically, hold down the volume down button while it boots. If it stayed off, hold down the volume down button and press the power button to boot the phone. The phone should boot into a text menu with the FASTBOOT option highlighted. Press the power button to select this option.
A phone started in bootloader mode with the FASTBOOT option selected.
3) Connect the device to the computer. Ensure the device drivers are installed. The FASTBOOT indicator on the phone should change to “FASTBOOT USB” when plugged in.
A phone after selecting the FASTBOOT option, but before connecting it the PC with working drivers.
A phone in FASTBOOT mode with a connection to the PC with working drivers.