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After uploading and installing 10.12.2 I lost use of my Bluetooth on my iMac 2015. There was a thunderbolt through the Bluetooth icon and the menu indicated that Bluetooth was not available. I tried various fixes including the deletion of the Bluetooth prefs in Library Folder and restarting with shift-control-option pressed. No success. I am now reloading 10.12.1 and hoping to regain use of my bluetooth keyboard and mouse. Any thoughts or suggestions? I sent a report to Apple.
 
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