With the last TW firmwares Samsung released A new security called [Defex].
And this protection prevent any process to run as root if it was not in the whitelist that provided in the kernel source code:
/system/bin/run-as /init /sbin/ /system/bin/ /system/xbin/ /system/vendor/bin/ /vendor/bin/ /tmp/update_binary
The first release of this protection was in Galaxy A8 2018 (SM-A530F) Android 8.0.0
and then released in Galaxy Note 9 (SM-N960F) 8.1.0
And all of these protections was defeated by some hex patching.
Now it is the time for SM-J701F:
Samsung released the source code of J701F today so i downloaded it and get a new patch to defeat the security