S-on htc one m9

I may have made a beginner boob here. I hope someone can point me in the right direction as I have searched all over the forums. My problem is this. I have managed to unlock the bootloader on my HTC ONE M9 and installed the latest twrp. I then tried to flash both Android Revolution HD 20 and Maximus HD 7. Both flashed fine right up to reboot. The only problem I can see is that the phone, even though unlocked, is set to s-on. I must have misread the fact that if the phone was unlocked and rooted, it didn't necessarily need to also be in the s-off state. My phone now won't boot, just keeps booting into the white bootloader screen. Is there any way I can get the phone into s-off from recovery mode or maybe some code using cmd?

Grateful for any help.
Thanks very much.

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