Older versions ie. JB etc  use an older version. Newer Versions of Android  use the latest. Fixes most issues on startup. Make sure you have init.D support and Proper SELinux support. Seems to be abandoned  no word from author. The only Firewall for rooted device is this one. Open Source for developer scrutiny and free. Beware there is a CopyCat Chinese version of this going around. This is the original. Use this one.
July 04 2016