Root Re-root problem

[Dahu]

Hi!
I have a problem with re-rooting my device. I Unrooted my device with SuperSU full unroot. I still have bootloader unlocked, and TWRP installed. I also installed custom ROM. But the problem is, when i try to install SuperSU(.zip) again through TWRP it says failed. I want to keep my current app's data. I don't know what I am doing wrong, can please somebody help me?

 

[Hadron]

Most custom ROMs are pre-rooted. If the one you are using is and you still have the zip you could just reflash that (without doing a reset - not needed when it's the same ROM), in which case that should root you.

I don't know why what you are currently trying is failing. Does it give any information other than "failed"?