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Open Spotlight -click on magnifying glass top right of your desktop.
Type Terminal -click Terminal to launch it.
Type in this command exactly the way you see it: defaults write com.apple.NetworkBrowser BrowseAllInterfaces 1 Hit Enter/Return key. Quit Terminal
Holding the Option key - right click on Finder Icon in your dock - click Relaunch
Open Finder -Airdrop should now be visible on your sidebar -to undo, open Terminal end command with a "0" instead of a "1" and relaunch finder.