Root possibility on 5.1.1

Hi all.
I dont know if someone already knows this by i'm asking also for myself :o
I know that there is a way (i.e. ping pong root-tested by me) to root out s6 (edge) without tripping knox only if we are on 5.0.2 with 5.0.2 bootloader. And i know there is a way to flash even without a custom recovery (i.e. flashfire -not confirmed).
So....is it possible to downgrade from totally stock 5.1.1 to 5.0.2?
After that....Is it really possible to flash rom ZIP using flashfire?:mad:
In this way the theorically have 5.1.1 rom (with root) with 0x0 counter, right?

Thanks in advance

Possibility to re-partition system-/data-/cache-partition on Stock-Slot (w/SS 3.75) ?

Hi!

My system-partition with 4 gig's of total space is too small for my needs. On the other hand, there's a cache size of 700 MB, which isn't needed when someone flashes a custom ROM, like I did.
My question: Is there no repartition-tool flying around (like Samsung-smartphones' "Pitfile-Magic"), with which it is possible to enlarge the data-partition to e.g. 6 (or 8) GB, cut the cache from 700 to 50 MB and enlarge the system from 800 to 1 or 1,5 GB?
I'd be glad to hear some hints from you out there.