Hi. Could you just give me some more clues on how to extract kernel from full stock firmware. I've got COI4 and didn't find kernel only, yet I could download full stock firmware.
I understand that afterwards I have to pack it as a .tar.md5 as indicated and flash it with Odin.
Thx in advance
Édit : catched. Just needed to unzip firmware.tar take boot.img inside
Edit 2 : it worked perfectly
I downloaded my exact firmware from sammobile (http://www.sammobile.com/firmwares/database/GT-I9195/
suppress .md5 suffix, unzip the .tar with 7zip. found boot.img.
Used trick given on former post to repackage boot.img into a .tar.md5.
Then applied post#1 guidelines.
I had some issues first time, once supersu downloaded : it was messed with knox, I probably wrongly answered and then I was not able to update supersu and was not fully rooted after reverting to original stock kernel.
So I redid once more, this time whole process went ok.