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???

how do I unroot with mobile odin without tripping knox nor loosing data?

Hey guys I just bought myself s6 edge and rooted it
Now most of my stuff requires custom rom which will trip knox and I don't want that to happen

I want to unroot my device now with mobile odin without knox nor without loosing data.
Guidance for me please??

Upgrade to Lollipop(Official) with loosing Data on Rooted, Knox 0x1 Device

Greetings xda,

I'll get straight to my problem. I was originally on AryaMod v6 but after the Official Lollipop upgrade was released for my region, I immediately restored to NANDROID backup of the stock firmware I took before flashing AryaMod. My Note 3 LTE is is currently Knox 0x1 and hence is not eligible to receive OTA updates.

My question is, is there any way to perform an OTA-like update that does not wipe any of my previous data?
Before I started this thread, I searched the forums for this problem and found one relevant thread: LINK but the user ultimately decided to go with the data wipe.

One possible solution that I have in mind is, I take a NANDROID backup, flash the Official Lollipop, Root and Install TWRP and then restore the Data partition. But I suspect this method is bound to cause some compatibility issues. And hence I would like the community's thoughts about this solution or any other better solutions that exist.

Thank you very much,
Eagerly waiting for your replies,
Have a good day,
UsmanJ