I read in the GPE thread that it uses stock kernel, but I'm not confident enough because I can't find any way to directly compare that statement with what's currently being used. I'm using flashfire rather than a recovery so I am trying to avoid soft bricking. Any help would be appreciated.

At&t 5.0.1 Stock Lollipop rooted

I'm trying to unroot in order to get the lollipop OTA update to work, but could only find the 4.4.2 firmware and not the original 4.3.