My first post after registering.
Hope to help in the future.
In the meantime, i tell you my Mega story
I rooted the stock firmware with the standard procedure, by flashing with Odin:
and launching supersu.apk on my sd (ver. 1.80)
then, after a few days, i flashed the latest release from Samsung,
and, before restarting, i flashed again CWM-recovery and installed SUPERSU.ZIP (1.80) on my sd.
Restarting in recovery mode, i installed again supersu.
i was knoxed 0x1 anyhow, but no knox app was installed.
no Wifi (it seems there's no stock apk running), google play store crashing continously, no emulated sdcard
So i decided to reinstall the new samsung OS, but then couldn't get root in any way if not thru PHILZ+vcoreroot2+supersu 1.93 procedure
here i'm again, rooted, i'd better say ROTTEN, without WIfi and play store.
Thanks in advance and good work.
It was hard for me to flash and reflash for the fist time!
I'm glad of taking part of this whole new world for me and of this great community.