I'll try but by all mean do your own research, it's not in my comfort area of expertise. It refer to System Integrity Protection* on MacOs which when enabled (

I'll try but by all mean do your own research, it's not in my comfort area of expertise. It refer to System Integrity Protection* on MacOs which when enabled (by default) is supposed to tightly control which and how privileged code is allowed to run at kernel level. https://support.apple.com/fr-fr/guide/security/sec8e454101b/web https://support.apple.com/fr-fr/guide/security/sec8e454101b/... It seems like OP issue is that in order to run a third party legacy kernel extension that doesn't follow most recent guidelines he need to disable this safety altogether for the whole OS. (And there is a separate issue because the third party legacy kernel installer require all external storage to be unmounted at install time, thus preventing installation on an external storage) I tried to be clear, english is not my mother thong, hope it might help. *Edit : System Integrity Protection is maybe the more adequate term instead of secure boot