nebu I think you should close this thread and move the discussions to the slim forums where you can have better admin control. With the popularity of 4.4 and slimkat, forum is cluttered by people that have no idea of how devs forum works and that ...
So, I found why substratum is not working for some, like me.
The rom breaks substratum when applying light charging support, it install a framework-res.apk that breaks SS in some way
So try reinstalling the rom without charging light support or o...
If you have unlocked bootloader and TWRP, you can flash a newer firmware using HuRUpdater
This steps can be risky for your device if you don't know what you are doing, so try to read some guide about flashing first
before attempt these operations...
Here is zipped STOCK framework-res.apk
unzip and place in /system/framework
set correct permissions and reboot
Without CM, you would be resident in some crappy apple forum. And XDA probably would't exist.