Cannot write in internal storage

Hello
I have weird problem, I cannot write in internal storage ; all apps functions that requires write access doesn't work.

I installed file explorer with root access. when I navigate to internal storage from " storage/emulated/0" I cannot create new folder (operation failed). but when I navigate to internal storage from "data/media/0" I have write access!

Every folder in the path have write access property.

I tried different solutions with no avail:
I formatted every thing and re-flashed the rom. same problem.

I tried:

Code:

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su
echo mkdir /storage/sdcard0 > /data/local/userinit.sh
chmod 700 /data/local/userinit.sh
reboot

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Code:

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su
restorecon -v -R /data/media

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Galaxy note II N7100
android 5.1
exodus-5.1 (cm-12)