su missing setuid
I have a 'problem' (more like a thing that annoys me). I'm posting it here as I'm not 10 posts older to be able to post it in the proper topic (cf-auto-root for note 3).
I've rooted successfully my Samsung note 3 (sm-n9005) using cf-auto-root. Everything it's ok,I can make backups with TiB, browse with Root Explorer, didn't saw any issue till now.
But I found out (using root checker pro) that /system/xbin/su binary is missing setuid.
Strange thing is that if I set setuid on it using Root Explorer, some time later is reverting back to 'su' without setuid.
I have installed SuperSU Pro (chainfire), Root Checker Pro, BusyBox (stericson) all latest versions from play.
Recently I flash TWRP, all working fine, but same setuid missing issue.
Any ideea what can cause unsetting setuid of the su and how to make this change permanent.