How to enable airdrop on an unsupported Mac
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Launch Terminal from /Applications/Utilities or via Spotlight.
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Enter the following command, and hit the “Enter” key:
defaults write com.apple.NetworkBrowser BrowseAllInterfaces 1
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Enter the following command, and hit the “Enter” key:
killall Finder
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Close the Terminal. If on a completely unsupported Mac, check that the Finder sidebar now shows an AirDrop entry, and open it.
If at any point you wish to check the current status of the AirDrop hack, issue this command in Terminal:
defaults read com.apple.NetworkBrowser
Here's a video
Activate.AirDrop.on.Mac.not.supported.mov
If you are unable to dd so follow this video: