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According to the description of this answer - https://developer.apple.com/forums/thread/134202#reply-to-this-question I have been able to successfully load the Debug version. But when I try to use the Developer ID to sign my NetworkExtension , I met a problem, so i manual add "-systemextension" suffix (content-filter-provider-systemextension) in a new entitlements file for Release. but when i trying to install it ,i get this error message Error Domain = OSSystemExtensionErrorDomain Code = 9 "(null)" . And I get the same error when I try to retest the Debug version. so, can anybody give me some suggestion, thinks! csrutil status System Integrity Protection status: unknown (Custom Configuration). Configuration: Apple Internal: disabled Kext Signing: disabled Filesystem Protections: disabled Debugging Restrictions: disabled DTrace Restrictions: disabled NVRAM Protections: disabled BaseSystem Verification: enabled systemextensionsctl developer off spctl -a -t open --context context:primary-signature -v &(appname) &(appname): accepted source=Notarized Developer ID