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Hi my name is ***** ***** to JustAnswer. I am reviewing your question and will post a reply ASAP.
So you tried changing some operating system files, and now it will not get past the loading bar, am I right about that?
Have you tried Safe Boot?
Can you provide me with your telephone number I can call you for remote tech support?
No problem, let me know your phone number and when I can call you and I can go through the troubleshooting with you.
We will try the SMC reset: https://support.apple.com/en-us/HT201295
And to reinstall the OS using Recovery: https://support.apple.com/en-us/HT201314
Let me know when you are ready, thank you.