Hi there, I am going to flash cyanogenmod on my Galaxy S4 GT-I9505. But i read that i have to back up some data. I tried to use "EFS Professional" but though i confirmed that popup where it says something with "RSA fingerprint" and the SU request, knox blocks it. So this way seems not to work. Now i just installed "root explorer" and manually back up the efs folder. It seems very small. Is that enough? Can i flash now?