[blkhwkz]

You absolutely do NOT need to do a hard reset before installing the official patch. I installed it on my stock ROM before I switched to a custom with no hard reset at all and it worked fine. Not only that it even fixed the dates on the existing text messages that showed 2016.

Just to clear this up after I read it again, if you were to do another hard reset in the future this would need to be applied again, but since you are back on stock already you can install it without another hard reset.