mobile

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I know this is an old problem and has been answered many times, i have read all thepossible ways to fix it and i have tried, over and over but I'm missing something.

Please help.

I rooted with Supersu, it worked for 2days then stopped. Now all the root apps can't work and i have tried everything to make it work, to no avail. Here is a copy of my Root hecker:

Root access not properly configured or granted.

Superuser Application Status
Installed: SuperSU by Chainfire - version 2.46

System Files Status
Standard Location
Command: ls -l /system/xbin/su:
Result: -rwxr-xr-x root root 66916 2015-04-17 00:03 su
Analysis: Root access IS correctly configured for this file! Executing this file can grant root access! Root user ownership is present and setuid attribute is not present.

Standard Location
Command: ls -l /system/bin/su:
Result: /system/bin/su: No such file or directory
Analysis: File /system/bin/su does not exist.

Alternative Location
Command: ls -l /sbin/su:
Result: /sbin/su: Permission denied
Analysis: File system permissions restricted and denied access.

Alternative Location
Command: ls -l /system/xbin/sudo:
Result: /system/xbin/sudo: No such file or directory
Analysis: File /system/xbin/sudo does not exist.

User Account Status
Error: stderr: [-] connect ui: Timer expired, stdout: null, exit_value: 1

Optional: ADB Shell User Status
Non-Root Shell User
Setting stored in /default.prop and configured as: ro.secure=1

Additional: System Environment PATH Status
System Environment PATH: /sbin /vendor/bin /system/sbin /system/bin /system/xbin

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So my device is rooted, but i don't have permission. Tried to copy .su file from xbin to bin, not possible.
Uninstalled reinstalled, unrooted rerooted, reinstalled SuperSu from playstore.
Made sure no double superuser programs running.
Got rid of Knox.
Tried to custom install Supersu update, says invalid certificate.
I extracted SuperSU.zip and tried to copy the .su file to \bin but also didn't work.

I believe if i can copy the .su file in \xbin to \bin the permissions wil be there. Bought Rootbrowser but error when copying. Or give permission on file SetUID.
Can't run Bootbox cause didn't install before root stopped working. Also Titanium backup stopped working now.

Any ideas how to fix? Don't want to factory reset. Can't be to difficult to fix. Any help will be appreciated this is the first time I have rooted.

PS. If this post is in the wrong place please advise where itshould be.
Thanks