Cannot change permissions on my main Big Sur drive

[Flyingfrog]

Hi. I've installed Big Sur 11.6.5 on my 2012 5,1 cup using OCLP. It works like a charm except that it won't let me change permissions on my main drive.
When I run the "crs util status" command in terminal, this is what I get
Apple Internal: disabled
Kext Signing: disabled
Filesystem Protections: disabled
Debugging Restrictions: enabled
DTrace Restrictions: enabled
NVRAM Protections: enabled
BaseSystem Verification: enabled

If I try and change the permissions, I get The operation can’t be completed because you don’t have the necessary permission.

Even stranger. in the sharing and permission window, only System is read and write, everyone is "read only" and I get that same error when I try to change that, or add my administrator profile.

Any input would be welcome.
Thank you.

 

[bogdanw]

If you disable SIP the normal way (csrutil disable from Terminal in Recovery), csrutil status retuns only
“System Integrity Protection status: disabled.”
I don’t use OCLP and you should wait for somebody that uses it for a proper advice, but I think you should check its configuration and remove unnecessary settings related to SIP. Clear the nvram afterwards and, if necessary, disable SIP the normal way https://developer.apple.com/documen...ling_and_enabling_system_integrity_protection