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macOS 10.13.4 Security Update

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I have a problem: I tried to install this update from both the AppStore and the Support Apple site. Both did shutdown the computer after some seconds and then rebooted. On the Boot Screen (Apple Logo and Progress bar) it fills the bar for about 10-15% and then keeps rebooting like forever. In Clover it automatically selects the preboot icon instead of the boot icon. If I select the boot icon it starts like normal but the update isn't applied. Please help!!
 
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TUF Z370-PLUS GAMING
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i7 8700
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having issues with my WiFi after the update.The connection is always strong, full signal, but, without warning, I experience 1 or 2 minutes of absolutely no internet. It looks as if I stop using it, it simply dies, but the signal indicator is still good. Don't know what is causing this to happen, nor what should a do to properly diagnose this, but I'm 100% positive that it started right after the update.

Posted a tread on the network section, in case anyone can help me: https://www.tonymacx86.com/threads/wifi-problems-after-high-sierra-security-update.252273/
 
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There is one more thing after update. I can't sign in my iCloud account.
"This action could not be completed. Try again."
Does anybody have this issue?
 

P1LGRIM

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There is one more thing after update. I can't sign in my iCloud account.
"This action could not be completed. Try again."
Does anybody have this issue?
This typically happens when your motherboard does not natively support NVRAM.
Test.
Fix : Install EmuVariableUefi-64 and RC scripts or install AptioMemoryFix or OsxAptioFixv3.
Or use one of the Clover Builds.
 
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Gigabyte GA-Z370N-WiFi
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i5 8400
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ASUS GeForce GTX 1060 O3C Dual (3GB)
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  1. MacBook Pro
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Ran the update, dual reboots and the nVidia tool downloaded appropriate updated web driver.. no problems :)
Thanks to all contributors with troubleshooting
 
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