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Q: Downgrade to El Capitan
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Oct 21, 2016 4:44 AMby Barney-15E,It's not a problem. You likely have some third-party incompatibility causing the problem.
To revert, you must erase the hard drive and restore from a backup you made prior to installing Sierra.
macOS Sierra: Revert to a previous macOS version
If you wish to figure out what might be causing your problems, post the results of this program: http://etrecheck.com
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Oct 21, 2016 7:29 AMby ArisHorizon,I fixed it, I found this https://discussions.apple.com/thread/7676338?start=0&tstart=0
I followed the instructions and I deleted the remaining files from flexihub app but nothing happened.
I thought maybe it was a problem caused by the Xbox 360 controller drivers so I removed it and finally the problem solved.
