According to XDA dev AntaresOne jflte team member built an unofficial Android marshmallow Rom CM13 for Galaxy S4
that is running quite well with 2 major bugs that is camera and Sims
are not Working in it right now.So he didn’t yet release the marshmallow rom for Galaxy S4 download link yet.Until he is quite satisfied with his rom.
►Working things up to now are:
- Adaptive brightness
- Notification LED: both channels (R,G,B)
- Sensors: accelerometer, barometer, gyroscope, proximity, temphumidity
- Sound, way better than CM12/12.1, for example instant screen lock sound when you press power key
- Touch keys leds
- Touch screen, including multitouch
- USB: charge battery, ADB, MTP for file transfer
- Camera: front and rear
- External storage
- IR led
- Microphone: both
You can check out the screenshot of running android marshmallow cyanogenmod 13 rom in Galaxy S4 below.
#How to install Cyanogenmod 13 Rom in Galaxy S4
CM13 Rom for Galaxy S4 and the appropriate Gapps 6.0 package
from link given below Copy it in your in your device.