It was asked a couple times, I didn't see a firm answer...
SBF back pre install - then install the zip, but bootstrap was mentioned.
So do I SBF, then root, then install?
Otherwise, how are you guys installing the zip file? I have pretty much always been rooted, so I don't remember if you can install a zip from stock recovery console.
Thanks in advance, I am hesitant to update without a firm answer.
I believe you do need to re-root (+unlock the bootloader & load CWmodRecovery), then you can apply the ZIP. That's what ended up working for me, anyway!