mobile

I have a Samsung galaxy SM-G900F with lollipop 5.0 and i do it the root following this guide: https://m.youtube.com/watch?v=iBNGeppOzGI and install the recovery modified and afer i flash the file to root from SDcard. I finished without problem. Yester day i flash in recovery mode the first file in this page:http://forum.xda-developers.com/show....php?t=2777835 to change the kernel ,bit when the phone rebooting appera the Samsung galaxy s5 logo and in the top on the left appear only The third text(yellow)that appears when you go on recovery mode "set warranty bit: kernel" and stop the phone remain in this state...after i go in recovery mode (And I had to remove the battery to turn it off) and i try at flash the file I had already used to root before and when the phone finsh the flash i reboot and remain blocked in a logo Samsung galaxy s5 And is changed only in the upper left check the second text (red) that should appear when you go into recovery mode :kernel is not seandroid enforcing(red)
set warranty bit: kernel (yellow)
the phine is blocked in this status And i am desperate and do not know what to doSorry if I expressed myself well because I'm Italian
I hope you understand