[Q] KF HD 7" Gen 1 - I seem to have lost root but still have TWRP topic

I can still get into TWRP,

I have the super user in settings and have allowed titanium back up although it says I do not have access to root.

I recently installed cynogenmod 12 from this thread. and it originally worked ( I had root access)!

The problem was when I downloaded Super su and updated the binaries, it went into a loop on the bootlogo. So I wiped and flashed again although now I had lost root access.

What can I do to get it back, or will I have to completely restart the process?

Thank you,

Jack.