Flash newer lollipop version without loosing root

I move the question here: I have a Galaxy note 3 rooted with Lollipop, now Samsung has relased a new firmware version ( only bug fix ) ; I want flash the new firmware and keep the phone rooted, there's a solution?
I was thinking to downgrade to KK and then flash the new firmware like I did when rooting lollipop the first time, but not so sure about the downgrde....
Any ideas???