Disable SIP El capitan

I have tried to disable SIP from OS X El Capitan following the procedure

Enter Recovery Mode
Open terminal
csrutil disable

and it works fine, if I type csrutil status it is disabled.

Then I restart my computer, but in my terminal the csrutil status returns this

System Integrity Protection status: enabled (Custom Configuration).

Configuration:
    Apple Internal: disabled
    Kext Signing: disabled
    Filesystem Protections: disabled
    Debugging Restrictions: disabled
    DTrace Restrictions: disabled
    NVRAM Protections: disabled

This is an unsupported configuration, likely to break in the future and leave your machine in an unknown state.

Why is it still enabled? I need to disable it because otherwise the system won't recognize my Vodafone key in Vodafone Mobile Broadband.

Solution

Apparently this is a known bug. See https://openradar.appspot.com/22361698 ; that is listed as a duplicate of another bug but that other bug doesn't appear to be publicly accessible.