Originally Posted by SaHiLzZ
You need stock recovery and locked bootloader to take updates
you don't need a locked bootloader to get an official ota update,however,you do need to flash a stock recovery !!.
I went through the ota update method to update my firmware as for some reason my htc one wouldn't s-off and I felt that it wasn't running as it should on custom roms with the old firmware.
I started off with a flashable zip -4.06.1540.2,developer edition then ota updates,always doing a nand backup of rom.
always pull the stock recovery image from the ota before updating...
i'm now running 5.11.1540.9 firmware and all custom roms are running good...
if you google 4.06.1540.2 dev edition flashable zip you should find it,if not,i can upload it too somewhere for you...
an official htc ota update changes your firmware and installs a stock recovery..
its a bit long winded this way,but,it was the only way for me !!