what process did you use? sounds like you maybe have htcdumlock enabled,wich has installed twrp into the boot partition.
if thats the case,we need to restore your original boot image.
normally with htcdumlock,the recovery backups up the boot image,you flash the rom,and if needed,you can restore the original boot image.
not being that familiar with actually using dumlock,im not sure wat the exact settings are,but you might look for an option in recovery to restore the boot image.
failing that,you might try flashing a rom,or we can try and find you a stock boot image to flash using fastboot.
The Delivery Guy
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