Link
This project was ported to the S4 about a year ago and then development stopped. Now somebody (AntaresOne) has picked up the project and continued development, adding features and updating it to support more ROMs. There appears to be support for the M919 which leads me to believe that it will also work for the M919N. If anybody wants to try it out and let the rest of us know if it works follow the link above and post your results.
This project was ported to the S4 about a year ago and then development stopped. Now somebody (AntaresOne) has picked up the project and continued development, adding features and updating it to support more ROMs. There appears to be support for the M919 which leads me to believe that it will also work for the M919N. If anybody wants to try it out and let the rest of us know if it works follow the link above and post your results.