AirDrop with iMac Mid 2011
If you have an iMac (21.5-inch, Mid 2011) you will be sad to know that you have an older version of Bluetooth. You cant download software to upgrade. The only way to get to Bluetooth 4.0 is to upgrade your hardware - basically get a new iMac. (For those technical reader the LMP Version is 0x4 when it should be 0x6.)
So what are you missing out by not having the latest and greatest version of Bluetooth? You cant use AirDrop functionality between an iMac and an iPhone.
So if your wondering why when you go to the AirDrop section of the Finder on your iMac and you dont see the iPhone, but can see the Phone using other MacBooks, its because your iMac is too old. This is the same reason why you cant see your computer on your iPhone on the screen that says Tap to share with AirDrop.'
The reason Apple with with Bluetooth 4.0 is because it contains high speed technology, a bit about that from the BlueTooth specs:
Bluetooth high speed technology (the Version 3.0 + HS enhancement to the Bluetooth Core Specification) uses a data-substitution method that offers faster throughput via momentary use of a secondary radio that is already present in consumer devices. By enabling the use of new radios without full system integration, Bluetooth high speed technology reduces costs while expanding future build opportunities.
Bluetooth high speed technology is ideal for synchronizing music libraries between devices, downloading photos in bulk, or sending video files from one device to another. Consumers enjoy powerful, wireless connection using the Bluetooth protocols, profiles, security and pairing features theyre already familiar with.- See more at: