at no point in that app does it say needs to be rooted even on the description on google play
but I have now found a way to change the csc all sorted now
Hi, I have stated in the app's description:
'CSC Changer': Allow you to change the CSC.
- WARNING: Changing the CSC will Factory Reset your device (wipe all user data).
- May need root access on the newer models. Also need Multi-CSC firmware.