Airdrop can't not find my Mac mini 2012

I have an iPad mini retina, an iPhone 5 and a Macbook air 13 2013. They can Airdrop between each other in the three.
I also have a Mac mini 2012. However, neither the Macbook air nor the iOS devices can find my Mac mini. Also, my Mac mini can not find my other devices either.
I have read the thread which says Mac mini 2011 is not capable of using Airdrop. But mine is 2012.
The handoff works perfectly in my Mac mini 2012. I can switch apps between devices. I can answer my phone through the Mac mini too.  So I wonder why airdrop is not working.
Anyone have the same issue?

I have solved this problem.
If you add your Mac mini an SSD and you use some method to enable the trim, like Trim Enabler, you should use the reverse action of the app provided or command your use. Now airdrop will work.
Then enable trim again.
If you believe above is not your reason, try below command in the terminal.
sudo kextcache -system-prelinked-kernel
sudo kextcache -system-caches
Then reboot your computer.

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