Asta îmi arată TinkerTool.

Poate o dezactivare și reactivare System Integrity Protection va rezolva problema.
csrutil disable - repornire - csrutil enable

When booted from Recovery, the command used to reset SIP’s configuration is csrutil clear:

csrutil clear 

csrutil clear run inside Recovery

When csrutil clear is run, SIP goes back to its factory-default settings. That means SIP is enabled if it was disabled previously and any custom configuration is cleared out.

https://derflounder.wordpress.com/2015/10/01/system-integrity-protection-adding-another-layer-to-apples-security-model/

Dacă nici asta nu are efect, încearcă să reaplici 10.11.6 Combo Update.