Originally Posted by SaHiLzZ
As I said, i have no personally tested it, but thats the only way to bring your HBOOT down to 1.55.
Other option will be to go all the way down to 1.44 HBOOT. You NEED to be comfortable with using adb/fastboot commands REGARDLESS whichever options you decide to go with.
I know how to go back to 1.44, I have done that before.
So what you are saying is that if I have the nandroid installed, and stock recovery from your thread, the phone will detect the OTA? It should install no problem because it will be a standard recovery.
HTC One - Stock GPe - Android Runtime