Default [Q] How do i fix un root?

I'm new to this guys. A quick run down is this.

Downloaded rom manager pro, root explorer,titanium back up and mobile odin pro. Along with the relevant cf root file zip and followed instructions.

Rooted s3 no problem.

Uninstalled and then re installed superSU through play store. No problem.

Through rom manager, made a back up through TWRP.

Flashed the galaxy project onto phone no problem.

Now superSU is saying i need the SU binary installed.

Rom manager can't find any back ups. Root checker is saying that my phone is not rooted which explains why titanium back up isn't able to do anything.

So now i'm thinking lets start fresh...go back to odin and re root. Well Odin CANNOT see my phone in download mode. Only when the phone is in normal operating mode it can be seen which is really weird. When i went into settings to look at <about device> i can no longer see the imei number or whatever it was. Not even sure if thats normal.

So.....What have i done wrong?? and how am i able to salvage this?

Can anyone help??