Unfortunately I found that out after the damage was already done. Is there any way to unlock the bootloader other than HTCDev? don't want to lose all my data without being able to make a nandroid backup first.Being s-off there was no need to re-lock the bootloader.
You will have to unlock again to flash twrp then you can flash SU.
After googling for the entire day I found this http://blog.drdroid.eu/2014/03/flash-twrp-on-htc-one-w-locked-bootloader-s-off/ would you recommend I try this? would it work? could it brick my device?