HELP WITH ROOTING N7105 - white shield with "unauthorized access..." notification topic

Hello, would appreciate help.
My n7105 is currently running android 4.3 (apparently that is the latest update as when i clicked on update it told me i am already running on the latest), the baseband version N7105TDVUEMK3, I have installed twrp 2.8, make a nandroid back up to get it ready for rooting. when i try to reboot i was ask to install SuperSu which i did. after booting the device I installed the new version of SuperSU and it asked me to remove Knox which I did. HOWEVER, I then tried to run reset Spen app I am told app fail to run the task and get the white shield with "unauthorized access..." notification telling me to "click here" I do and nothing happens.

Any suggestions on how to disable it completely? Am I missing something? I want full control.

Also, when i check to see if there is any update via OTA, it said this device is modified so can update? can you can i make the system status official so you can receive OTA updates

Thanks!

[Q&A] [KERNEL][AGNi][CM] 25-01-2015 AGNi pureCM v2.9.1_R2/v4.3.7 N7105 (ULTRA SMOOTH topic

Q&A for [KERNEL][AGNi][CM] 25-01-2015 AGNi pureCM v2.9.1_R2/v4.3.7 N7105 (ULTRA SMOOTH)

Some developers prefer that questions remain separate from their main development thread to help keep things organized. Placing your question within this thread will increase its chances of being answered by a member of the community or by the developer.

Before posting, please use the forum search and read through the discussion thread for [KERNEL][AGNi][CM] 25-01-2015 AGNi pureCM v2.9.1_R2/v4.3.7 N7105 (ULTRA SMOOTH). If you can't find an answer, post it here, being sure to give as much information as possible (firmware version, steps to reproduce, logcat if available) so that you can get help.

Thanks for understanding and for helping to keep XDA neat and tidy! :)