Samsung SM-T330 Root on 4.4.2 please??

Hi
My little boy has autism and so cannot handle when things change and look different.

I have an SM-T330 running 4.4.2 (uk) which is rooted and has been great but is starting to hiccup a bit so I wanted a backup plan and so I bought another SM-T330 from ebay.

Problem is that I rooted mine about 9 years ago and cannot remember how I did it, but also the new tablet is on 5.1 android.

I cannot find a CF root available for 4.4.2 please help.

I tried to do kingoroot one touch on it and it has bricked it, so I am currently downloading both the stock 5.1 and 4.4.2 to try fix that using ODIN (but I am so out of my depth)
So if I manage to un-brick the tablet, I will be looking to try use ODIN to root it.

But so far I can only find CF-autoroot files that say they are for 5.1

Does anyone know if these would work on 4.4.2 or would they brick it again?

Or does anyone know where I can get a CF-autoroot file for 4.4.2 please

I am honestly out of my depth so apologies if I am not using all the correct terms, I just hope to get it on 4.4.2 and rooted (Once I have that, everything else I have backed up with titanium backup).

Please help
Really hoping to avoid 5.1 as my boy would not handle the difference.

Thanks
Alex